Is It True That I Can Be Stronger If I Make Love The Devils Daughters?

Synopsis

Orphaned after his parents were murdered, Uta Rain was auctioned off as a slave. Certain he would be treated terribly, he was in despair. But what awaited him was a luxurious meal and five pretty sisters, the daughters of the demon lord defeated by the hero 16 years ago. Uta's fate begins to change drastically.