When Touka is in the school’s infirmary, people all over the world are attacked by tentacle monsters. However, these monsters can not only devour their victims but also take over their bodies and turn more people into monsters. Some pupils and teachers manage to escape to safety in the library and the neighbouring part of the building. But the monsters still have a lot planned and the peace and quiet is deceptive, especially as Touka, who was devoured by one of the attacking creatures shortly after the attacks began, suddenly reappears…