Doku wo Kurawaba Ai Made

Story

Luciana, the son of the Arcadia family who rules the underworld. The peaceful days of running the orphanage are completely changed by the summoning order from the current head of the family to all the siblings.That's because it was a "wiping" warning that if he didn't come forward as the next head of the family with his fiancee, he would be permanently expelled. She was desperately looking for a temporary partner, but what appeared in front of her was Lal, a man as dangerous as "poison"...?

Synopsis via AniList (English).