Maou no Musumetachi to Maguwaeba Tsuyoku Narerutte Hontou desu ka?

Also known as: 魔王の娘たちとまぐわえば強くなれるって本当ですか？, Is it true that I can be stronger if I make love the Devil's daughters?

by Sanmyaku Kamome, Nabe Fuyuno

Orphaned after the murder of his parents, Uta-Rain is eventually auctioned off as a slave. Desperate to be treated badly again wherever they take him, Uta awaits…… Surprisingly, he was awaited by a magnificent meal and five beautiful older sisters. But they are the daughters of the Demon King, who was defeated by the hero 16 years ago….!?