Between Kokomi Naruse and her close friend Suzuka Ishikawa, teacher Nanami Natsuki begins to harbor forbidden feelings. After class, Nanami keeps Kokomi behind in the classroom, slowly drawing out her allure. At first hesitant, Kokomi gradually finds herself drawn to Nanami's words and demeanor. Witnessing this, Suzuka confronts Nanami in protest, but during their encounter, she too falls under Nanami's spell. Soon, both girls begin to desire winning Nanami's affection for themselves, intensifying their emotions in a growing web of desire.