Mai Sakurajima's path began with childhood acting from age six. Modeling and television work, facilitated by her mother's photography agency, launched her into early fame. This trajectory fractured during her third year of middle school when her mother coerced her into an unwanted swimsuit photo shoot. Recognizing herself as a financial asset, Mai declared an indefinite acting hiatus. Entering Minegahara High School mid-semester, she encountered entrenched social circles. Students avoided interaction, fearing association with her celebrity status would invite their own exclusion. This isolation, layered upon unresolved bitterness toward her mother, triggered Adolescence Syndrome – a supernatural condition causing her gradual invisibility and collective amnesia about her existence. Objects she touched also vanished from perception. Her presence became imperceptible to all until Sakuta Azusagawa saw her wearing a bunny costume in the library. Mai presents a serious demeanor masking inherent warmth. She embodies "Type B tsundere" traits, often responding to Sakuta's teasing remarks with physical reactions like pinching or stepping on his foot, actions stemming from flustered embarrassment rather than true anger. Despite her reserve, consistent kindness defines her, especially toward Sakuta's sister Kaede, whom she supports with gifts and encouragement. Academically gifted, Mai achieves strong results and tutors Sakuta. Her selflessness manifests when she secretly administers sleep aids to him, aware his consciousness alone prevents her complete disappearance. Her relationship with Sakuta evolves from initial reluctance to profound interdependence. After he publicly declares their connection via a school confession to halt her fading, she tests his commitment by demanding a month-long proof of devotion. Though angered by his methods initially, she later credits him for her decision to resume acting under a new agency while shielding him from media scrutiny. She openly declares her love for him during a press conference when their relationship surfaces, demonstrating protective loyalty. Sacrificial acts mark critical development. In one timeline, she dies pushing Sakuta from a car's path, later becoming Shoko Makinohara's heart donor. This profound selflessness reflects her core, though timeline alterations ultimately prevent this outcome. Her compassion extends to forgiving her mother's exploitation after Shoko's intervention creates an alternate reality where her mother expresses remorse. Post-high school, Mai attends Yokohama City University while continuing her acting career. She adopts a more mature appearance, abandoning her signature bunny-themed accessories. Subsequent professional roles include police officer and singer. By age 22, she maintains her enduring relationship with Sakuta.