Engage Kiss

Bayron City thrives on a newly discovered energy source that has made it one of the world's richest cities, but behind its polished surface are demonic hazards handled by private military companies. Shuu Ogata runs one of those companies and hunts demons for money, yet he can barely pay his bills. His greatest asset is Kisara, a demon bound to him by a contract that gives her enormous power whenever Shuu pays with pieces of his own memories.

Every mission brings them closer to the truth Shuu is seeking about his past and the disappearance of his family, while also erasing parts of the life he is trying to understand. Between Kisara and his former girlfriend Ayano, the fight against demons becomes inseparable from relationships Shuu may not be able to preserve if he keeps sacrificing what he remembers.