Moekatan is a favorite of a neighborhood uncle, a caring and kind girl who secretly does naughty things to her without her mom and dad knowing. Moe today, the uncle is playing a more naughty prank on her than usual. She's a kind girl who can't refuse, so she accepts it if it makes the uncle happy, but when will she grow up and have to say goodbye? He doesn't know, but for now he just wants to have fun. That's what the uncle thinks.