A dedicated but struggling ronin student named Saito harbors a deep crush on his beautiful next-door neighbor and friend. Sumire is the epitome of kindness; she often cooks for him and offers unwavering support. Though she is happily married to a man whose nightly activities Saito can clearly overhear through their thin walls—fueling his intense jealousy—Saito's obsession with Sumire has become undeniable. His fantasies are constant; whenever he has free time between studies or exam prep sessions for university re-entry exams,
he finds himself masturbating while picturing her perfect figure. One day in his room, a sudden shriek from Sumire jolts him into action. Rushing outside to find her embracing him mid-panic attack over an infestation of cockroaches inside her home, Saito is asked to help eradicate the pests. As he searches the cluttered space, Sumire strategically presents her round backside to his view, her panties completely visible, making it impossible for Saito to maintain any semblance of composure.
Overwhelmed by desire, Saito finally blurts out his long-held secret: he desperately wants to have sex with her. He scarcely believes what he hears when Sumire responds with an affirmative! Their illicit affair begins immediately, setting up a delicious dynamic where Sumire becomes his personal remedy for sexual cravings, ensuring he can focus on his studies without distraction.
