My name is Karekitsune Taka. It is a home security guard who is in service for 20 years. I make good use of a high-performance personal computer monitoring equipment, i am engaged in secret activities. The mission came to my such origin unexpectedly.

Katsuragi Shouko. This female is the mastermind. My fathers remarriage partner, aiming at the property of our house. Otherwise it remarries to father who is not fun, living together never.

This females new husband, it hardly returns home by work. In other words this female the unlawful occupation of this house. Moreover, there are three people all-female. An overwhelming, numerical, disadvantageous situation. Mother is Shouko. The daughter are Yuki and Sayaka. The females move into the new home in five days. Till then, there should learn it doesn't want to be related to this house and me ever again. The first target... Older sister Katsuragi Sayaka!!

To regain peaceful every day, candid shot threat development! Home guard is just dispatched!