An ordinary high school student, Satou Ichirou, was born to a demon father and a human mother. Together with his best friend (← one-sided), the beautiful grim reaper Freddie, and the money-obsessed Rinto, who looks almost like a rabbit, he is enjoying his high school life in the demon world today!

17-year-old Satou is part demon/part human boy with a facial expression set in stone. Enjoy his misadventures in the Makkai (the demon world) private high school as the only transfer student from the human world. On the first day of school, Satou leaves a lasting impression on future monster classmates, and manages to tick off resident hot shot Grimreaper (aka talking bones), who's now dead set on seeking revenge for his humiliation - except, when it comes to Satou, things never go as planned...