This time, Shota sets his sights on a female college student who lives nearby. Having known her since she was a baby, he gets away with all sorts of mischievous pranks she'd normally get angry about—but she always responds with a warm smile. Curious about breasts, Shota freely touches her G-cup tits, and rather than resisting, the older sister seems to enjoy it, her smile never fading. Gradually, she starts getting turned on, letting out lewd moans without realizing. Then, falling right into Shota's clever prank involving alcohol, she eventually starts grinding her hips on her own, writhing in ecstasy. The story captures how her kindness and softness draw her deeper and deeper into Shota's naughty games.