Private tutor Ai is assigned to a male student who has repeated a year. His parents, wanting him to focus on his studies, arrange a special setup—leaving the two alone together in the study room. For the boy, whose sexual desires are just beginning to emerge, this environment becomes an unexpected stimulus, pulling him into a whirlwind of emotions. Particularly on days when his mother is away, the events that unfold in the empty room become a crucial turning point, leading toward the story's climax.