From Ann: When people are killed all the time, expelled and get rid of them, monsters and demons became disappearing species. Someone should take care of them, and this is what Yamada Sintar trains: it will become a keeper of monsters. Armed with two four and talking rabbit, he goes to fight the devices to the demons, hoping to defeat them enough to get a monster keeper license. It was while he does it, he meets Nao, ordinary (albeit an unusually beautiful and cruel) high school, and instantly falls in love ... in her neck. Now Yamada has a new mission in life: protect Nao and not give anyone monsters, ghosts, hunters for demons or others-stand on his backstage.