HBAD-381 Nao Wakana, an unparalleled old man who ties up and punishes his older and cheeky sister with her brother-in-law who visits her at night.

Wakana doesn't want to follow her parents who are being transferred overseas. Wakana wants to live alone, but her worried father won't allow her and ends up leaving her at her uncle's house. Wakana stays at the house of her uncle whose wife ran away and his lascivious son, but the lascivious son's friend turns out to be lascivious again...The men try to do something about Wakana, who is emitting erotic pheromones...