Shunichi Odagiri can hear humans' inner thoughts through their spirit animals which are called heart beasts. Shunichi, who knows the ugliness and foolishness of human beings more than anyone else, have felt ...

Ryuusei saves a demon girl and ends up dying so she shares half of her power with him and now he's basically a demon too. If they separate, he dies. If they don't find the one who summoned her within a year,...