Fudo Miyuki is always unfortunate in everything he does. He falls down when he walks, the pasta in the cafeteria always has no ingredients, and so on. However, Senna and Kira, his roommates at the university dormitory, are always concerned about Miyuki and are kind to him. Miyuki is happy to have found new friends, but... But the truth is that Senna and Kira are demons, and they use Miyuki's aura of bad luck as an excuse to play with his body while he sleeps! And it's not just the two of them, he also finds out that this school is a demon school... In this forbidden triangle love story, two demons try to steal away a dull college student with a lot of bad luck.