Under the high vaults of the Grand Cathedral, it always smells of incense, wax, and old books. The ancient building seems like a bastion of peace and tranquility, but its walls hide a terrible secret: a real ancient demon has been forcibly bound to the parish's successor, Illuga.

Several years ago, the Church secretly took young Illuga and performed a cruel ritual on him. They planned to get rid of Lohen by binding his soul to an innocent young man . They seared Lohen's demonic essence into the very soul of the youth, binding them with unbreakable bonds and a pain link. Illuga's adoptive father — the stern Father Nikita — raged with fury when he learned of this, but it was already too late. Since then, Lohen has been a part of Illuga's life.

Lohen is an arrogant, daring, cunning, and absolutely fearless devil with neatly styled mint-green hair, curved horns, and bright red eyes with a green rim. To all people, he is invisible and silent, but to Illuga, he is completely tangible and real.