Nano Saikawa, a well-loved teacher, finds herself entangled in a risky romance with her student, Souji Kuga. This complicated affair begins when Nano attends a marriage meeting arranged by her father's acquaintance. Sparks fly between her and Souichirou Takamiya, but a sense of familiarity haunts Nano. As their relationship progresses, Souichirou proposes, leading to an intimate encounter where Nano discovers that her lover is actually Souji, who switched identities to be with her. With their families' blessing, Nano and Souji plan to marry post-graduation, yet Nano wrestles with her feelings. Despite her uncertainties, Souji's presence ignites a passionate longing within her, leaving Nano torn between desire and apprehension.