Muichirou is a demon slayer, he can never be touched by outsiders, except when necessary he just had a fight with Douma - Second High, he was seriously injured after fighting him, fortunately Muichirou escaped quickly so he was saved by him, he fainted under the tree, the wound was very heavy, difficult could make it out, he thought he was going to die here, he fainted. After waking up, he found himself in an unfamiliar room, with strange devices when suddenly the door opened.