Chapter Summaries

Linde transmigrated into the world of Undertale and survived his fall into the Underground after several attempts, then met Frisk. The two introduced themselves and agreed to work together to find a way out.

• Linde died after falling into the Underground and discovered that he could reload his save.
• Linde repeatedly tried to land on the flower bed and finally survived the fall.
• Frisk fell into the flower bed, and Linde realized he could no longer reload.
• Linde waited for Frisk to wake up, then told her he had also fallen underground by accident.
• Frisk cautiously trusted Linde, and they introduced themselves.

Frisk and Linde encountered Flowey in the Underground, where he revealed their souls and tried to lure them with so-called Friendliness Pellets. Linde was gravely wounded protecting Frisk as Flowey surrounded them with bullets and declared that the Underground followed the rule of kill or be killed.

• Frisk and Linde entered a doorway among the stone pillars and met the talking flower Flowey.
• Flowey revealed Linde’s purple-and-yellow soul and Frisk’s red soul, then claimed that gaining LOVE would make them stronger.
• Flowey sent Friendliness Pellets toward the pair, and Linde tackled Frisk out of their path.
• A pellet grazed Linde, cracking his soul and leaving him bleeding and near death.
• Frisk demanded to know why Flowey had attacked them, and Flowey summoned a swarm of pellets around them.

Toriel rescued Frisk and Linde from Flowey and guided them into the Ruins, where Frisk discovered she could use the Save Point and inspect a shared party panel. The children followed Toriel deeper into the Ruins, growing closer as they tackled its puzzles hand in hand.

• Toriel arrived after Flowey attacked, healed Linde, and introduced herself as the caretaker of the Ruins.
• Linde stood up and revealed he had been pretending to be hurt, so Frisk punched him in the shoulder before following Toriel.
• Linde and Frisk found a Save Point that Toriel could not see, and Frisk activated it to save their progress.
• Frisk opened her personal panel and found that it displayed the stats of both her and Linde.
• Toriel led the children through puzzles in the Ruins as they teased each other and continued holding hands.

Linde and Frisk learned how to deal with monsters as Toriel guided them through the Ruins. After Toriel left them waiting alone, Linde discovered that determination gave him extraordinary physical strength.

• Frisk frightened the ghost inside the training dummy with her awkward attempt to talk, and Toriel praised both children.
• A Froggit confronted them, but Toriel scared it away with a cold stare before it could attack.
• Linde teased Frisk as they continued through the Ruins, and Toriel led them past a spike-floor puzzle.
• Toriel tested the children by having them walk through a corridor alone, then gave Linde an old cell phone and left them to wait.
• Frisk told Linde that a famous human could run a hundred meters in 0.2 seconds, prompting Linde to realize that determination let him sprint at about a hundred meters per second.

Frisk and Linde traveled through the Ruins, learned to spare monsters who no longer wanted to fight, and survived encounters with two Moldsmals. After a mysterious being watched them from an unstable gray space, their journey continued.

• Frisk followed Linde onward after receiving an encouraging phone call and heard Froggit's advice to show mercy to monsters who stopped fighting.
• Toriel called to warn Frisk that the puzzles ahead might be too dangerous, while Frisk threatened Linde for teasing her with a nickname.
• A Moldsmal injured Frisk, and Linde comforted her by talking the monster into fleeing before feeding her Monster Candy.
• Frisk and Linde encountered another Moldsmal, which left satisfied after Linde imitated its wriggling movements.
• Frisk asked why injuries hurt even when her soul was not directly struck, and Linde explained that the soul extended throughout the body.
• A mysterious being watched Frisk and Linde from a gray, unstable space.

Frisk and Linde continued through the Ruins, and Linde comforted Frisk after she revealed that her parents had died. They encountered Napstablook, whom Frisk cheered up, while her Flirt Master skill embarrassed her and amused Linde.

• Toriel called Frisk and Linde to ask whether they preferred cinnamon or butterscotch and whether they disliked cinnamon.
• Frisk told Linde she had climbed Mount Ebott out of curiosity, fallen into the Ruins, and lost her parents.
• Linde revealed that he was an orphan too and reassured Frisk that Toriel and others cared for them.
• Frisk and Linde found Napstablook pretending to sleep, and Linde left Frisk to figure out what the ghost needed.
• Frisk cheered Napstablook with acceptance and a joke, then accidentally flirted with him and made Linde laugh.

Linde gave Frisk the Faded Ribbon, then was ambushed by three monsters after ignoring her warning. Frisk reloaded the timeline and saved him, and they continued onward until Toriel hurried out of a small house.

• Linde tied the Faded Ribbon in Frisk's hair, and Frisk equipped it in place of her Bandage.
• Linde ignored Frisk's warning and was struck by bullets from Lukeye, Vegetoid, and Gospel Roach.
• Frisk pulled Linde clear, fed him Monster Candy, spared the monsters, and confirmed she had reloaded the timeline.
• Linde realized he remembered events from before the reload and speculated that other monsters might retain such memories.
• Linde led Frisk left at a junction toward a large leafless tree, where Toriel hurried out of a small house.

Toriel brought Frisk and Linde to their new home and showed them the room they would share. After a night in the same bed, Frisk woke up embarrassed when Linde caught her staring at him, and she punched him.

• Toriel reunited with Frisk and Linde, led them to her house, and showed them their shared room and a butterscotch-cinnamon pie.
• Frisk claimed the bed while Linde made a nest on the floor, and both children fell asleep.
• Toriel found Linde on the floor, placed him beside Frisk in the bed, and left pie slices in the room.
• Frisk woke up on top of Linde, assumed Toriel had put him there, and tucked the pie into her backpack.
• Frisk studied Linde while he slept, but he woke and noticed her flushed face, so she punched him.

Frisk and Linde decided to live with Toriel and began exploring the City of the Ruins with her. After learning how monsters acquired magic, they both agreed to let Toriel teach them, and she took them home to begin.

• Toriel welcomed Frisk and Linde, and they decided to stay with her.
• Frisk asked to call Toriel Mom, and Linde followed, taking her other hand.
• Toriel took the children into the City of the Ruins, where they met a shopkeeper and learned that many monsters there did not mind humans.
• Linde asked how monsters learned magic, and Toriel offered to teach him and Frisk.
• Frisk and Linde eagerly agreed, so Toriel led them home to start their lessons.

Toriel discovered that Linde could use magic because his unstable soul let determination release its power. After Linde accidentally killed a monster disguised as a tree with a spell, he gained LOVE and rushed to Frisk to ask her to load the save.

• Toriel tried to teach Frisk and Linde magic, but they could not sense magic power, so she researched human magic and concluded that they could not learn it.
• Frisk and Linde secretly read Toriel’s book, and Linde realized he might be a human with the potential to become a mage.
• At dinner, Linde showed Toriel that his soul appeared when she summoned a weak fireball, and Toriel recognized him as a mage.
• Outside [Home], Linde used determination to control the power leaking from his unstable soul and created a keyboard that cast the word “death.”
• Linde’s spell destroyed a tree that turned out to be a monster, earning him EXP and LOVE, so he hurried inside and asked Frisk to load the save.

Linde learned the true history of the war between humans and monsters from Toriel, while Frisk struggled with the voice keeping her awake in the Ruins. Seeing how badly Frisk was suffering, Linde decided he might have to leave the Ruins despite his reluctance to leave Toriel.

• Linde demonstrated his character-based abilities and healed Frisk after she dodged his Strike attack.
• Toriel explained that a monster who absorbed a human soul slaughtered humans, grew powerful by absorbing more souls, and was ultimately destroyed by the souls within him.
• Toriel recounted how the monster's killings sparked the great war, which ended with the monsters' surrender and their sealing beneath Mount Ebott.
• Linde realized that a voice urging Frisk to wake up for the future of humans and monsters had kept her from sleeping for two nights.
• Linde watched Frisk suffer and, reluctant to leave Toriel, stood and walked toward her.

Linde convinced Toriel to let him and Frisk leave the Ruins, and Toriel revealed that Asgore had collected six human souls. After they said goodbye and passed through the great door, Flowey threatened to test their kindness, and their journey began.

• Linde told Toriel that a voice kept waking Frisk and asked how they could leave the Ruins, prompting Toriel to reveal Asgore had gathered six human souls and agree to let them go.
• Toriel sparred with Linde to test his combat skills, then healed him and promised she would stay in contact after they left.
• Linde brought Frisk outside, and she and Toriel said an emotional goodbye before Toriel escorted both children to the great door.
• Linde and Frisk left the Ruins, where Flowey appeared and warned that their kindness would be tested by a cold-blooded killer.
• Linde reassured Frisk, took her hand, and opened the door to begin their journey.

Linde and Frisk met Sans in Snowdin Forest, then hid from Papyrus while he complained about his brother and prepared to capture a human. After Papyrus left, Sans asked the children to let his brother see them, and they agreed before continuing onward.

• Linde and Frisk traded a skeleton pun before Sans emerged from the bushes and introduced himself.
• Sans led Linde and Frisk behind a human-shaped lamp as Papyrus approached, and Linde tickled Frisk while they hid.
• Papyrus scolded Sans for neglecting his post and declared that he would capture a human and join the Royal Guard.
• After Papyrus left, Sans asked Linde and Frisk to cheer his brother up by letting him see them, and they agreed.
• Sans headed back the way he came, while Linde and Frisk continued onward.

Linde and Frisk explored the snowy area, dealt with Snowdrake and Icecap, and then encountered Sans and Papyrus. Papyrus challenged them before leaving, while Linde kept Sans’s teleportation ability secret from Frisk.

• Linde gave Frisk the Tough Glove and showed her his powerful Slash attack.
• Linde and Frisk humored Snowdrake, then ignored Icecap until Linde took his hat and helped him feel better without it.
• Linde and Frisk playfully fought in the snow, then changed their wet clothes behind nearby bushes.
• Linde and Frisk met Sans and Papyrus, who realized they were humans and Papyrus declared that he would stop and capture them.
• Sans left after reassuring the children, and Linde avoided explaining how Sans had appeared ahead of them.

Frisk and Linde passed Doggo and spoke with Toriel by phone before meeting Sans and Papyrus at an invisible electric maze. Linde’s prank on Frisk backfired when she made him take the shocks instead.

• Doggo attacked Frisk, but Linde calmed him by petting him, then healed Frisk and continued with her.
• Sans explained how to avoid blue attacks, and Frisk called Toriel, who spoke with Sans for an hour.
• Frisk deduced that Toriel and Asgore had separated over a conflict involving humans, while Linde listened in surprise.
• Linde invited Frisk to dance on the ice, but neither knew how, so they fell into the snow.
• Sans and Papyrus presented an invisible electric maze, and Papyrus revealed its route by walking through it.
• Frisk crossed the maze safely, but after Linde made her take a shock, she shoved the orb into his arms and stomped around the maze, repeatedly shocking him.

Linde and Frisk met Martlet, a former Royal Guard, who told them about Clover’s journey through the Underground and his death at Asgore’s hands. Martlet invited the children to stay the night, and Linde carried the sleeping Frisk to bed before falling asleep beside her.

• After teasing Linde and Frisk, Sans watched them leave and continue along the path until they found a ladder at the edge of a cliff.
• Linde and Frisk climbed down to a cabin, where an elderly blue bird monster introduced herself as Martlet, a former member of the Royal Guard.
• Linde asked Martlet about the human she had met decades earlier, and she recounted how Clover traveled through the Dunes and the Abandoned Factory before challenging Asgore.
• Martlet told Linde and Frisk that Clover had died after learning Asgore had killed five other children, then invited them to spend the night at her home.
• Frisk fell asleep on the couch, and Linde carried her to the guest room, laid her on the bed, and fell asleep beside her.

After waking from a long dream of Chara's memories, Frisk traveled through Snowdin with Linde, who suspected Chara was attached to her. Linde got Sans's room key through a secret codeword and continued onward with Frisk to the skeleton brothers' puzzle.

• Frisk woke after sleeping until noon and told Linde about her dream of a little monster resembling Toriel, Toriel, and King Asgore.
• Linde realized the dream was likely Chara's memories and worried about Chara's dark past and attachment to Frisk.
• Linde and Frisk said goodbye to Martlet, climbed back to the cliff, and bought ice pops before reaching the snowball puzzle area.
• Linde sent Frisk to play and privately gave Sans the codeword "I'm the legendary fartmaster," earning Sans's Room Key and placing it in Frisk's inventory.
• Frisk and Linde continued on and met Sans and Papyrus, who presented them with a word scramble puzzle.

Papyrus’s frozen spaghetti trap became edible after Linde powered the microwave with magic, but the meal tasted so awful that Frisk retched and turned on Linde for misleading her. Linde fled toward Sans while Frisk chased him, leaving their quarrel unresolved.

• Papyrus and Sans argued over whether crosswords or word scrambles were harder, and Papyrus left after joking about filling every crossword square with Z.
• Linde and Frisk found Papyrus’s frozen spaghetti trap beside an unplugged microwave, and Frisk asked Linde to power it with magic.
• Linde used lightning magic to run the microwave, and Frisk heated the spaghetti and ate a large bite.
• Linde tried a noodle and warned Frisk that the spaghetti was awful, but Frisk ate it and began retching.
• Linde gave Frisk a Nice Cream to clear the taste, but Frisk accused him of misleading her and charged at him with the plate.
• Linde called Frisk his wife and fled toward Sans as Frisk chased him.

Frisk used Linde’s map to activate a hidden mechanism, then got distracted by Lesser Dog and thought Linde had been taken. Linde had actually arranged for Sans to take him to the True Lab, where he obtained a vial of determination, while Frisk continued on to Papyrus’s puzzles.

• Frisk uncovered the map, found its marked spot, and activated a hidden mechanism that brought Lesser Dog to attack her.
• Frisk petted Lesser Dog until his neck stretched into the sky, leaving Linde alone as the Dog Couple appeared over him.
• Frisk found Linde’s note explaining that the Dog Couple had invited him to Grillby’s and that Sans had agreed to help him.
• Linde asked Sans to take him to the True Lab, where he told Alphys he could eventually restore the Amalgamates and took a vial of determination.
• Linde returned to Grillby’s with Sans, while Frisk reached Papyrus and struggled to understand his puzzle rules.

Frisk arrived in Snowdin while Linde studied a new book about theories on how humans gained physical bodies and determination. After Frisk spared Papyrus, he adopted the nickname Linde had invented for him and declared himself the Great Waluigi.

• Frisk arrived in Snowdin and saw Linde reading a book about the origins of humans' physical bodies.
• Linde left the library, told the proprietor that Waluigi was Papyrus's nickname, and secretly used Frisk's hand to create a key before returning to his room.
• The next morning, Frisk went ahead while Linde slept, encountered Papyrus, and spared him after their battle.
• Papyrus went to the library seeking books about dating, and the proprietor told him that Linde had nicknamed him Waluigi.
• Papyrus embraced the nickname and declared himself the Great Waluigi, leaving Linde dismayed that he had changed Papyrus's course.