Phantom Invasion, Vol. 1: Volume 1 - Kumosuke Yamada

Alone and disoriented in an environment utterly alien, Ryou soon realizes he's been transported to a world dominated by monster girls. These Phantoms far surpass humanity, but Ryou discovers that he has an ability of his own--he can bewitch these femme fatales and have them do his bidding! The potential to form the deadliest harem ever seen is at his fingertips, and it's all for the sake of...revenge?!