Mika Itou possesses long green hair consistently secured by a distinctive bunny ear-shaped headband and light blue eyes. She has a slim figure and is notably petite, described as one of the smallest characters in the series. She attends the Academy and belongs to its swim team, occasionally seen in swimwear, maintaining a fairly popular status among students. Her background includes an early sexual encounter with her boyfriend on a building rooftop, where she loses her virginity despite initial concerns about being seen. Following this, she and her boyfriend witness swim team captain Shinobu Kobayashi and associate Mikimoto sexually assaulting fellow swim team member Miyuki Nonogusa in the locker room. After watching for a period, Mika enters, teases Nonogusa, and facilitates her boyfriend raping Nonogusa. Mika changes into her swimwear, kisses Mikimoto passionately, and engages in a group sexual encounter involving all present, later expressing interest in repeating the experience. Mika demonstrates a strong interest in the occult as a devoted follower of classmate Kaori Saeki, regularly having her fortune told through Saeki's tarot cards. She actively defends the credibility of black magic and becomes angry when its validity is dismissed. In a later incident, she visits the Academy infirmary after being summoned by nurse Reika Kitami. Kitami initiates physical contact, prompting initial resistance from Mika. However, Kitami uses a magical incantation inducing intense arousal in Mika, leading to a sexual encounter during which Kitami reveals a phallic appendage. Despite initial shock, Mika participates willingly under the spell's influence. This incident contrasts with her earlier sexual behavior, as she displayed resistance despite prior experiences. Her motivations for visiting remain ambiguous, though she checks the window for onlookers upon entering, suggesting possible awareness of Kitami's rumored activities with students. In game narratives, she suffers public humiliation when magically compelled to strip and masturbate in a classroom, leading to severe emotional distress including neurosis and suicidal ideation. This drives her to seek revenge against the perpetrator, Taki Minase, resulting in divergent outcomes: she either kills him with a knife or uses an aphrodisiac drug leading to his death during intercourse. Alternative game storylines show Kitami intervening to subdue Mika's suspicions through magical coercion, resulting in Mika participating in a sexual encounter with both Kitami and Minase simultaneously. She also appears in potential game narrative orgies within the art club classroom. The second game reveals her temporary absence from school following the classroom incident, though she later returns to confront Minase. Depending on his honesty regarding his magical involvement in her humiliation, she either seduces him into intercourse to provoke his girlfriend or requests a "good memory" before performing oral sex, with his girlfriend discovering them in both scenarios.