An unexpected spacetime warp flings Kells and his harem of mercenaries to the far-flung Western Continent. In pursuit of a mysteriously vanished demon lass, the party ventures into the legendary vampire sanctuary—the Castle of the Moonlit Night.

A lolicon skeleton butler lays out a ridiculously trollish path of trials; an air-headed Medusa awaits the "conquest" of her chest; a misguided Death Maiden wields her "Daddy's 'rod'"; a tsundere fallen elf princess is reduced to being the pervert's "big sister." The awakened tentacle power of his left hand elevates the art of sleaze to a whole new level! But the journey's end is not the truth, but an even more profound mystery—the Demon Realm of 400 years past! Hurled into the past, Kells faces the God of Destruction and the Heart of Creation. He must use his own two hands... no! His left hand, to forge a new destiny!

Even in the face of a world-ending crisis, the Grand Harem Project must never stop! This time, it's not just about the panties—all the girls of the past and future must be brought into his collection.