堕天の狗神 −SLASHDØG− ハイスクールD×D Universe (Associated Names)

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. Few…