Main character lives alone and leads a normal school life till he meets girl Haruka at the school gate.
Suddenly Haruka becomes assaulted and insulted. A huge robot and glasses girl oppose Haruka and get defeated by her. Haruka turns out to be a magical girl who fights for justice, and she forces protagonist to cooperate.
The next day main character awakens and sees Haruka cooking in the kitchen in an apron. She has been kicked out of the house in order to start independent magician life. Protagonist's peaceful house suddenly gets crowded with a lot of girls - either relatives or acquaintances - and all of them decide to live here.

[From vndbreview]