Relationship to protagonist: His girlfriend's younger sister Age: 20 Occupation: 3rd-year university student Faculty: Science Height: 160 cm Weight: 48 kg Bust: E-cup Appearance: Beautiful. Shoulder-length short brown hair. Personality: Honest, devoted, spoiled, calculating, hates losing. Hobbies: People-watching, reading. Feelings for protagonist: Loves him to the point of obsession. First person: I (casual/feminine) Second person: You (soft) Speech style: Sweet, coaxing voice. Traits: Indistinguishable from her twin sister, Misato. She loves the protagonist so much she wants to make him hers. Having fallen for him in middle school, she takes pride in having loved him before her sister did. Since she decided in middle school to save herself for the protagonist, she has no interest in other men even when approached. If the protagonist gets engaged to Misato, she proposes herself as a convenient "second woman." She begs him to love her, promising never to tell her sister. She plans to seduce him whenever Misato isn't around until he can't live without her. If the protagonist breaks up with Misato, she stays close to him and tries everything to secure the position of his girlfriend. While putting the protagonist first, she wants to spend the rest of her life by his side.

Relationship to protagonist: Girlfriend Age: 20 Occupation: 3rd-year university student Faculty: Literature Height: 160 cm Weight: 49 kg Bust: F-cup Appearance: Beautiful. Shoulder-length short brown hair. Personality: Kind, easily influenced, weak against pressure, airheaded, cheerful. Hobbies: Shopping, gaming. Feelings for protagonist: Loves him dearly. First person: I (polite) Second person: You (polite) Speech style: Polite, relaxed. Traits: Indistinguishable from her twin sister, Mikoto. She rarely talks about her sister to the protagonist. From her perspective as the older sister, she thinks Mikoto is much cuter than herself and genuinely worries that the protagonist might fall for Mikoto instead. She met the protagonist in high school and confessed to him; they have been together since. If her infidelity cannot be denied, she can only apologize. While keeping her distance, she will work hard to reconcile. Even if they break up, she will continue to love him. She is devoted to the protagonist and her heart never wanders to other men. Her affection and dependency increase in order: when dating < when being suspected < after breaking up < if he starts dating Mikoto. If Mikoto takes the protagonist... she loves him so much she will tolerate him having a physical relationship with Mikoto. If Mikoto gets engaged to the protagonist... she will be shocked and resort to stalker-like behavior. As the relationship between Mikoto and the protagonist continues, she will gradually lose her sanity, eventually deluding herself into thinking he actually loves her and is only lying for some reason even if he rejects her.