Ais

Biodata

Feature	Details
Name	Ais Wallenstein (艾丝)
Alias(es)	Sword Princess
Gender	Female
Affiliation	Loki Familia
Occupation/Role	Adventurer; swordswoman
First Appearance	Chapter 39

Power Progression

Stage / Realm / Level	Chapter	Notes
Level 5	43	Identified as a Level 5 adventurer when Loki sends her to summon Ritsuka for dinner. Her development abilities include Hunter, Abnormal Resistance, Swordsman, and Mental Recovery. 43 51
Level 6	75	Reaches the level represented by Ritsuka's Sword Princess template. Ritsuka returns the template's accumulated Strength to Ais, further triggering signs of her unusual bloodline awakening. 75

Background / History

Ais held the historical fastest record for advancing from Level 1 to Level 2, taking one year—a record later surpassed by Ritsuka. She is already a renowned swordswoman in Orario when she first takes notice of Ritsuka, recognizing the steadiness of her steps. 35 39 74

Initially focused almost entirely on becoming stronger, Ais joins the Loki Familia on a shopping trip only after learning that red bean cream fried potato balls are available. Her interest in Ritsuka grows after Lefiya returns with a Golden Sword connected to the outsider. 39

After Ritsuka joins the Loki Familia, Ais serves as her messenger and later becomes her regular training partner. Ritsuka teaches her to concentrate Wind Spirit Dash around her sword and introduces her to the principles of Hundred-Beast Slayer. Though Ais cannot initially withstand the technique, she continues training despite the difference in strength. 43 49 75

When Ritsuka is trapped deep in the Dungeon, Ais secretly leaves the Familia estate to rescue her, gathering Lefiya, Tiona, Tione, and Bete in the attempt. She later tends to the exhausted Ritsuka and accepts Ritsuka's offer to act as her temporary hero. 52 53 54

During the Loki Familia expedition, Ais confronts Udaios with the Familia's support. She uses her wind-enhanced swordsmanship to target its Magic Stone while Ritsuka intervenes to protect and reinforce her at critical moments. The battle leaves Ais unconscious after Udaios employs its hidden ultimate skill. 60 61

Before leaving Orario, Ritsuka transfers the Strength gained through the Sword Princess template back to Ais. The transfer exhausts the template but strengthens Ais and causes her spirit-like bloodline to begin awakening. 75

Appearance

Ais is a golden-haired young swordswoman frequently recognized by her title, the Sword Princess. She is depicted wearing blue light armor during the Loki Familia's deep-floor expedition. 43 61

• Golden hair. 43
• Commonly carries a sword or rapier. 49 52
• Wears blue light armor on expedition. 61

Personality

Ais is quiet, direct, and intensely driven to become stronger. Her blunt honesty can be unintentionally insensitive, such as when she describes Ritsuka's Imaginary Number Space as desolate. 47

Despite her reserved demeanor, she has an innocent and occasionally airheaded side. Fried potato balls are a reliable way to sway her decisions, and she becomes openly absorbed in eating them or playfully using a scallion as an improvised rapier. 39 58

Her determination becomes especially clear when Ritsuka is endangered: rather than wait for permission, Ais immediately resolves to rescue her. She is also competitive in training, pushing herself past exhaustion to continue sparring with Ritsuka. 52 75

Abilities & Skills

Swordsmanship

Ais is an elite swordswoman whose skill and physical control allow her to recognize subtle details in another fighter's movement. She can maintain pressure against powerful foes and adapt her swordplay under Ritsuka's instruction. 39 49

• Uses fast thrusts and slashes to exploit openings in an opponent's defenses. 49 60
• Can target a Floor Master's Magic Stone while fighting at close range. 60
• Learns rapier techniques from Ritsuka. 49

Wind Spirit Dash

Ais's wind magic enhances her movement and can be wrapped around her sword to reinforce thrusting attacks. 49

• Forms wind around her body as a protective, speed-enhancing armor. 60
• Compresses wind around her sword to increase its piercing force. 49 60
• Can use wind beneath her feet for sudden aerial movement and evasive bursts. 60
• Its output can strain her body when pushed beyond her limits. 60

Hundred-Beast Slayer

Ais learns a version of Hundred-Beast Slayer through Ritsuka's instruction. It is a divine-speed sequence of consecutive sword strikes, but Ais initially lacks the speed and mastery to match Ritsuka's version. 49 75

• Attempts to counter Ritsuka's technique using Wind Spirit Dash. 49
• Continues practicing the move despite being unable to complete more than four strikes before being disarmed. 75
• Is regarded by Ritsuka as insufficient, at that stage, for defeating Udaios. 75

Development Abilities

• Hunter — Improves monster-hunting effectiveness and assists in identifying monster weaknesses. 51
• Abnormal Resistance — Reduces the effects of abnormal conditions such as paralysis and poison. 51
• Swordsman — A sword-focused development ability supporting her combat specialization. 51
• Mental Recovery — Gradually restores mental energy. 51

Equipment / Weapons / Items

• Despair Sword / Despair's Between — Ais's primary sword; it is damaged during training with Ritsuka and later retrieved for the expedition. 49 58
• Rapier — A weapon Goibniu gives Ritsuka specifically for Ais after repairing her sword. 50
• Blue light armor — Worn during the expedition's lower-floor operations. 61

Relationships

• Emiya Ritsuka — Training partner, mentor, and temporary hero. Ais leads an unauthorized rescue effort when Ritsuka is trapped in the Dungeon, accepts Ritsuka's protection, and receives Strength from her before Ritsuka leaves Orario. 49 52 54 75
• Loki — Her goddess and the head of Loki Familia. Loki is protective of Ais and warns Ritsuka not to make her sad. 57
• Riveria Ljos Alf — A maternal, protective senior within Loki Familia who worries about Ais's condition after the Udaios battle. 39 61
• Lefiya Viridis — Fellow Familia member. Ais shows jealousy when Lefiya receives Ritsuka's attention and care. 62 64
• Tiona Hiryute — Close companion who playfully clings to and teases Ais. 39
• Finn Deimne — Loki Familia's captain, who coordinates the party's support while allowing Ais to face Udaios herself. 60

Notable Quotes

“I'm going to save someone.” 52

Trivia

• Ais's former record for the fastest rise from Level 1 to Level 2 was one year. 35
• Red bean cream fried potato balls are one of her favorite foods. 39 57