Idol! Kamen Rider! Unknown Combination? (Part 1)

The girl took a sip of coffee, looked at the three idiots who were squeezing each other a little nervously, and chuckled, "No need for that, seniors."

Sento took a sip of coffee, glanced at the tense Fire-Chasing Squad, and then turned his attention to Bella, the doll in Kiana's arms, with a hint of curiosity.

Let's push the timeline back a little...

Having become accustomed to all sorts of unexpected events, Xing quickly calmed down and remembered that she had seen this defeated dragon on TV before she transmigrated, so she naturally greeted him in Japanese.

Soon, Ryuga noticed the Build Driver she was wearing and the table full of bottles behind her.

PS: When Sachi and Sento exchanged worlds, they brought some of the items around them with them, so both of their official toys are still there.

After some questioning—

"Eh, so you're saying you're Build from another world?"

"Hmm, based on your description, that Mr. Sento is indeed me from this world. Can you show me your strongest transformation item right now?"

Because the other party was a very cute girl, Ryuga was not on guard. In addition, with Sachi's charm buff, he readily took out his Ginga Dragon Muscle Bottle, even though Lord E was not around.

"(Hmm, I roughly understand what stage we're at now. No need to worry about some Lord E or K-boss popping up.)" Xing glanced at it and silently put away her Bubble Rabbit Tank. Sigh, Lobster Doctor was too unhelpful. He couldn't even pull out a Danger Trigger. She didn't even have anything she could use to save face.

"Speaking of which, Mr. Sento should be in my world right now, right?" Sachi took the canned coffee that Ryuga handed her. "Have any unusual events happened here recently? Like, an enemy suddenly appearing that wants to World Destroyer or something?"

"Oh, there were a few, but we defeated them all." Ryuga proudly puffed out his chest, then suddenly a question occurred to him, "Hey, how did you get here? Sento suddenly disappeared, did you disappear too?"

The girl nodded helplessly. She pointed her finger a few times in the air and, to Ryuga's bewildered gaze, summoned the Guidance Module to check the situation.

PS: From Ryuga's perspective, he can't see anything except Sachi dotting things there.

"(Eh, just a routine collision. We'll just wait for it to finish. No monsters to fight this time. It's all due to the build; a spatial swap occurred during the world collision, and things will return to normal after it ends. So peaceful this time, no boss spawned? That's great, consider it a vacation.)"

"Well, I don't think we need to worry too much. With Mr. Sento's strength, my world shouldn't pose much of a threat to him. It seems quite peaceful here too. Before we discuss how to switch me and Mr. Sento back, could you grant me a request, Ryuga- senpai?"

Seeing the girl's sincere eyes, Ryuga felt as if his heart had been shot with an arrow. He had a girlfriend, and he couldn't fall for a little girl!

"Ahem, just say what's on your mind, no need to call me 'senior,' though I quite like it... (chuckles sheepishly)"

"Do you provide lunch here? I'm hungry," Xing said, pointing to her stomach.

"No problem... What did you say?!" Ryuga suddenly remembered that he hadn't earned his food money yet.

"Hey, Gento, Kaito, something terrible has happened! See you at XX Restaurant! Cough cough, I'm not just here to freeload, something really has happened! I swear on my promise as Sento's future girlfriend!"

—Hopefully, the official team can help Sento escape singlehood—

"Achoo!" Sento from the Sento Honkai World suddenly felt a chill. He shook the Tank Full Bottle in his hand, broke free from Kane's grasp, and tried to sort out the situation. "Um, I'm not a bad person. Who is this Luming you just mentioned?"

As a genius physicist, Sento was able to understand and communicate fluently in English, even though the boy spoke English.

"That's Tank Full Bottle on you, why do you have something Luming's End?!" Kane stared at him warily, defiantly pulling out the Beat Closer.

"That sword is Banjo long. Shouldn't you explain why you're carrying it?" Sento frowned and put on the driver.

"Nonsense! This was given to me by Luming. And where did you get this belt from?" Kane retorted without backing down, summoning his Cross-Dragon to transform and defend himself.

Bang!

The sound of metal colliding with flesh echoed in the basement. Sento looked on with embarrassment at Little Te who Kane with a single punch. She slowly walked forward and stopped a certain distance away from Sento. Seeing that she seemed to have no hostility, Sento shifted his gaze from the three iron fists on her back and curiously examined her. "A bionic robot? Impressive, it's so realistic. I'd like to meet your creator."

A beam of light shone from Little Te's eyes. After scanning the entire body of the Sento, a glint flashed in Little Te's eyes, and he concluded, "Analysis complete. The composition of the Fullbottles you possess is completely different from that of Master, ruling out the possibility of theft."

Sento was initially startled by her sudden scan, but after recovering, he squatted down with interest and tried to shake hands with Little Te. "What do you mean by different components? Hello, my name is Kiryu Sento, and I'm a genius physicist. By the way, you're a robot, right? Can you let me know about your structure?"

Little Te looked up at the black-haired youth who was in an unusually excited state, puzzled. For some unknown reason, one side of his hair was sticking up like a rabbit's, and the reason behind it made people curious.

"Analysis complete. An anomaly has been detected. We need to contact the PhD for resolution."

Little Te reached a conclusion. She stretched out her iron fist and grasped Sento's hand. Before he could react, the iron fist suddenly spewed sparks, carrying him out of the basement and straight into the sky. Little Te clung to the remaining iron fist and flew after them, while Ai-chan clung to the last iron fist to catch the last train, leaving Kane bewildered in the wind.

"Have you forgotten about me? Don't leave me to face the store manager alone after my afternoon nap!"

—Hopefully Kane won't be strangled to death by a furious Natasha—

In the Knight World, Sarutobi Kazumi, listened to Ryuga's description and couldn't help but curiously examine the beautiful girl before him. "So, she's Sento from another world? She looks even younger Miku, doesn't she?"

"That's true, but I'm nowhere near as good as Mr. Sento. Hey, Kaito- senpai, I just heard Ryuga- senpai give a brief description of your achievements. Could you sign your autograph for me?" With her eyes sparkling, Sachi pulled out her autograph board and moved closer to Kaito, instantly transforming into a little fangirl.

Try to understand that it's normal to have any reaction when a virtual character you've always longed for appears in your life.

"Huh? Well, I'm not some big star, but since it's your request, I can't refuse." As an idol otaku, Kaito was a little shy, but he still signed the autograph.

Ryuga was a little annoyed. Hey, why didn't he ask me for an autograph? I'm way more handsome than him, okay?

"Um, can you sign another 'red dad'?" the girl blinked and asked in a pleading tone.

Kaito found it a little strange, but he did as he was told. "I don't know why, but this way of addressing me feels quite warm."

"NICE! Could you please transform and take a picture with me again?" Xing pulled out a camera from behind her back and said excitedly, "Basic Grease is fine, no need to transform into Blizzard or Perfect World, I know those two are too much of a burden for you!"

"Just kidding, I only use it because it's powerful! Wait a minute, I'll call my buddies over to transform into the Perfect Kingdom and take a picture with them!" Perhaps it was because he cared about his image, or perhaps it was just the typical male masculinity of wanting to show off in front of girls, Kaito and made a phone call to Sanbagaras as well.

Ryuga silently watched the girl excitedly shouting around Grease's Perfect World form, and suddenly had an urge to pull Sento over and transform him into Kito to settle scores with Ryuga.

As for why we didn't consider Ginga Dragon, Ryuga, would rather die than ask that bastard father for help again.

"Huh? What are you doing?" Gento, in his Crocodile Ice Form, arrived just in time. Since he hadn't learned how to hail a taxi yet, and the driver had taken leave, he transformed and ran over.

The purple crocodile knight unfurled his cape and joined the battle, thankfully almost dying on the spot in bliss. My goodness, for knight fans, this moment is paradise!

An honest signature plus an honest photo—

Just as Sachi calmed down a bit, Ryuga, in his Magma Dragon Form, squeezed in to make his presence known. "Hey, did you forget something?"

"Ah, because I also have a Cross-Z partner, so strictly speaking, I'm not that interested in you. Sorry," Xing said apologetically to Ryuga.

"Ha, you muscle idiot, get out of the way. You already have a girlfriend, why are you still flirting with an innocent girl?" Kaito pushed him aside. For some reason, he felt that this girl reminded him of Miku.

"Don't you have a girlfriend too?!" Ryuga got angry and started fighting with him, but it was just a minor squabble between friends.

When the topic turned to romantic relationships between knights, Sachi looked curiously at Gento, who, known for his Honest Man and simple-mindedness, lowered his head and whispered, "My dad arranged a blind date for me..."

Sachi: "Gento... you're really honest."

"Then, could you please tell me your story in detail? I only heard a brief account from Ryuga- senpai before, which is not enough to satisfy my curiosity. There's a coffee shop over there, how about we talk there?"

"Ah, okay." The three of them, having just deactivated their transformations, agreed, but following Sachi's gaze, they saw a familiar place and immediately turned pale with fright. "Um, how about we go to another place?"

"Hey, why is the coffee brewed by the manager of that coffee shop called 'nascita' so bad?"

"It tastes pretty good now, but before... it would have killed a human." Ryuga's face darkened as if he had recalled some bad memories.

"Ahem, Ryuga 'm right. Hey, bearded guy, it's your turn to treat this time. Don't be stingy with the knight lady from the parallel world." Kaito quickly chimed in, not forgetting to give Gento a wink.

"Yeah, there's a nice shop nearby. I heard Utsumi mention it last time." Gento nodded honestly, and together with Kaito, they pulled Sachi away.

The three idiots, through their tacit understanding, successfully dissuaded Sachi from meeting Miku and the shop manager. Just as she was about to leave with regret, an angry female voice entered her ears—

"What... what are you doing to this girl?!"

"No way, Miku?" Ryuga was almost scared to death.

"Mitan? Didn't I tell you to wait for me inside?" Kaito exclaimed in shock.

"Train, green peppers, the worst combination..." Gento recalled that painful past.

"?" Xing blinked, looking completely bewildered.

The Sanbagaras, who were watching the drama unfold, said, "The boss is still being completely dominated by his sister-in-law today."

PS: The main reason the three idiots didn't want Miku to know about Sento's disappearance was to avoid worrying her; of course, they were mostly just afraid.

—As it turns out, Misora Miku is the person you absolutely shouldn't mess with in Kamen Rider Build—

Sento sat in the interrogation room, carefully observing Bronya who was interrogating him. "So, can I conclude that I've come to a new world?"

"Then how do you expect Bronya to believe that what you're saying is true, and not that you're a liar?" Bronya looked at him coldly. "Now all the clues point to you. Tell me honestly, is the disappearance of that girl named Chen Xilumeng related to you or not?"

"This is terrible..." Sento rubbed his hair in exasperation. "That Luming is also a Build, right? According to the information I have so far, she is the one using the Build System in this world? And according to the combat records you showed me before, she seems to have defeated Grease and Rouge. That's amazing. She can do that with just Rabbit Tank Sparking."

"What are you saying? Answer my question!" Bronya slammed her hand on the table, speaking in a threatening tone.

"Hmm, I see... Do you recognize this?" Sento thought for a moment and took out a red device from his coat pocket.

"What is that?"

Sento chuckled, opened the glass cover, and pressed the button.

Hazard On!

Rabbit & Rabbit!

"Build Up!" Are You Ready?"

Unlike the transparent conduit in the Build base transformation background, a dark and cold steel frame unfolded around the young man. Noticing Bronya's shocked gaze, Sento understood that in this world, the Danger Trigger had not yet appeared.

"Although I hate violence, isn't this the best proof?"

Sento took a deep breath, crossed his arms, and softly recited the spell that, in Yuki's eyes, contained infinite magic power—

"Transform!"

Overflow! The Crimson Swift Leaper! Rabbit Rabbit! Yabeeee! —Haee!

(The last two mean "Oh no! -- So fast!")

Sento, now in his Build Sento Twin Rabbits form, easily sat back down and confidently asked, "Now do you believe what I said, little Bronya?"

"Data detection... that's powerful!" Bronya's forehead was covered in sweat as she tried to figure out how to deal with it, when she received an order from Tesla to bring Sento to her.

Half an hour later—

"Wow! Another world? This is so interesting!"

"There's no Nebula Gas, but Honkai Energy? Interesting, I must figure out its principles!"

Kiana and the others watched with a headache as the black-haired youth with his spiky hair excitedly wandered around the Fire-Chasing Squad's secret laboratory, while Dr. Tesla had already picked up a wrench.

Half an hour later—

"YEAH! We're the perfect match!"

"Hey! You're pretty good, kid. I'm quite interested!"

Looking at the two people who seemed like longtime friends, Little Te began to doubt his program.

The Fire-Chasing Squad, who were just watching from the sidelines, were also questioning their existence. How did that man manage to conjure up that bunch of seemingly amazing gadgets? Although they looked just like the useless inventions made by Lobster Doctor.

"This genius has been building Transformers these past few days, do you want to come and help?"

"Of course! Scientists and robots are the perfect match!"

Kiana stared blankly at the two who had fallen into a frenzy, then turned to Mei beside her and asked timidly, "Um, what are we here for again?"

Mei shook her head in confusion as well. She tried to use her electricity to calm the two geniuses down, but it was blocked by the electric shield that Sento had casually created.

"Why do I have a bad feeling?" Bronya looked at the two genius scientists who were completely immersed in their own world and silently activated Yamabuki Shield.

Half an hour later—

"Oh no, this genius just miscalculated a decimal point!"

"It's alright! I'll transform into my Scarlet Drill Form to block the damage. The experiment continues!"

Boom!!!

Amidst the ruins, the Fire-Chasing Squad, hiding inside Yamabuki Armor's shield, cautiously peeked out and sighed as they watched the two still hammering away.

"Who brought him back?!"

Little Te, who had already slipped away to charge his phone, said, "Undergoing maintenance, please do not disturb unless necessary."