Mei Etoh, a student at Seioh Private High School, presents as reserved and distant, actively avoiding social interactions. She ignores greetings from classmates and maintains minimal contact even with her long-term friend Mutsuki Uehara. This behavior originates from an elementary school incident where her unanimous election as class representative resulted in peers neglecting duties, burdening her alone and fostering deep distrust that led to emotional withdrawal.

Despite secretly desiring closer connections, Mei struggles to express emotions or initiate conversations due to profound shyness. She prioritizes academic excellence, viewing non-study activities as wasteful. Her diligence extends into limited free time, where she practices digital art and animation at a near-professional level. She frequently remains on campus after classes to study in the library.

Her involvement with the student council starts indirectly through projects like room renovations and event organization. Though initially skeptical of school activities, she accepts the treasurer position, where her strong organizational abilities prove valuable for efficient task management.

Mutsuki Uehara, her childhood friend, persistently encourages her to engage with others, including the student council group led by Manami Amamiya. Mei's relationship with Mutsuki carries understated complexity, as she does not outwardly acknowledge their shared history despite his consistent efforts.

Over time, participation in collective activities fosters gradual openness in Mei. She contributes to initiatives such as inter-school tournaments and festival preparations, signaling a shift toward communal engagement. Her journey reflects a tentative reconciliation between academic dedication and social growth, though expressing vulnerability remains challenging.