At seventeen, Ririka Asou knows little about life or love and has never seen her cousin Yuu Moriya as anything more than a familiar relative. Yuu has deliberately hidden his true capabilities, keeping himself physically and socially unremarkable in order to stay close to her without drawing attention. Ririka wishes she could remain ignorant of the feelings he has carried for years, but a single kiss shatters the quiet surface of their relationship. Yuu’s long-concealed desire erupts into increasingly aggressive advances, and Ririka finds herself caught between confusion, fear, and an unwanted attraction she cannot suppress. What began as a peaceful teenage existence becomes a turbulent entanglement of coercion, guilt, and conflicted emotion. Set in a contemporary Japanese high school environment, the story follows the escalating push-and-pull between the two cousins as Yuu pressures Ririka into a relationship she never asked for, and Ririka struggles to reconcile her instinctive resistance with the strange pull she begins to feel toward him. The narrative tracks the progression from forced intimacy to reluctant emotional involvement, exploring how love can emerge from deeply troubling circumstances.