High schooler YĆ«ta Iridatsu has experienced âastral projectionâ i.e. his spirit has been separated from his body. He woke up in a mansion named Koraikan and met a cat spirit named Chiranosuke, who told him âYou must find the Sacred Tome of Koraikan in order to return to your physical body.â While searching through corridors of Koraikan, YĆ«ta bumped into underpants of its female residents, and doing so would, eh, create some big trouble for planet Earth.