Shota, who lives in the same apartment building as the big-breasted Akane, becomes close friends with her and begins devising various schemes to play naughty pranks on her large breasts. He creates opportunities to visit her by asking her to cook for him, then takes advantage when her hands are covered in flour and she can't move easily—grabbing her from behind to grope her breasts repeatedly. He even invites friends over and sets up situations where they can touch her chest. He also plots chances to bathe with her, escalating his pranks in numerous ways. Eventually, genuine feelings for her begin to grow, deepening their relationship.