Protagonist, usual schoolboy who frequents general school. He had the close friend with "Erotic happening habit inadvertently" and "Harem constitution".

That name is Tsukasa. In the reputation when it is more cute than the girl, popular regardless of sex perfect honor student. And to Tsukasas surroundings, there are six girls who aim at him.

Compared with the best friend like Protagonist of the light novel, i am an obviously supporting player. It tends to be relied on variously for a long time, though it variously examines and it was well informed, only it is supporting role. Every day was spent while cheering up oneself i was going to become a supporting role for the best friend.

One day, Protagonist opens the luggage of the mystery that reaches by the carriers mis-distribution by mistake. Injection syringe, medicine bottle of mystery, handcuffs, guide of abduction confinement, chain cutter, simple hypnosis device etc... Preternatural goods become complete on the inside, internally in the box "Compulsion training set" it was written.

It is time when thought that danger was felt and it was going to deliver luggage to the police. Mail with the photograph reaches from Tsukasa. The harem photograph which was trouble but seems to be fun. It is seen, feelings that mope darkish have rapidly spouted to the heart. Only the child of a taste gathers around Tsukasa... It might be nice, about one person...