Jinx's manga / #High Rating/Recommended(7803)

Thanks to his mother's remarriage, Amou Reishin becomes part of a family that leads one of Japan's leading business conglomerates. Unbeknownst to him, the company's underworld business is that of assassination. His stepbrother Garaku is a psychopath who enjoys particularly sadistic ways of killing. Now Reishin and his sister Sarasa are Garaku's new playthings.

Demon seme x 25yo human uke Uke randomly chanting a spell and accidentally summoning the demon (seme) moreover the spell is a fated-pair spell! It binds them together & seme can't go back to the demon realm