The story begins when Muu moves into the Ashitaba residence as the new husband-to-be for their older daughter Hinata. But things won't be easy with the wedding preparations, a mother-in-law that has no sense of delicacy, and her younger sisters Asuna and Shion; and their eccentric aunt Megumi.

This is not the typical harem-like manga, as Hinata's mama adds a "plus" as her caring nature really creates hilarious situations.