Caught with a severe fever before his school trip, Tobio Ikuse, a second year high school student was forced to missed out on his school trip with his schoolmates on a luxury liner Four days later, the news about the disappearance of the teachers and second year students from his school reaches Tobio’s ears Fewslowly recovered from the lost of his friends, accidentally encounters one of theht up with him but was shocked to see Sasaki with a Lizard Monster and attacked him with the monster Cornered by theluxury liner, Natsu by Natsuht, Tobio found hiain this time by two people with monsters, amidst all of that, out of Tobio’s shadow ca off the two ain approaches Tobio and decides to bring him to their hideout