Mion, the sister-in-law, comes to help with housework while her sister is away giving birth. Koji, who hates cleaning, finds himself captivated by Mion as she tidies up the room. Every time she uses the vacuum, her cleavage becomes see-through, and as she bends over to wipe the floor, her clothes ride up—leaving Koji flustered and unable to look away. Pleased by his reaction, Mion grows bolder, whispering, "Not just housework—I'll take care of this too," as she reaches down toward his crotch.