Naoki and the gang make their way to the port city of Rihanella, but just when our ostensible hero thinks he can catch a break, he is confronted by two succubi of the dark lord sent to kidnap him! Good thing Tianne's around to save him; but after realizing the succubi didn't turn into his sex slave after they consumed his semen, Tianne suggests depositing the hero's sperm "directly into their wombs" to see if they can convert them to their fold.
And so the harem grows even more in the latest installment of the Tales of a Harem series!
Included in this volume is the bonus chapter Volume 5.5 featuring Naoki the Hero and his faithful handmaid, Mila!