Naoki Oikawa was busily fapping away to his naughty porn mags when he was suddenly transported to a fantasy world filled with demon lords, monsters, and... sexy babes? Join the ostensible MC-turned-hero as he helps his comrades defeat the demon lord by using the power of his own semen! (Source: Irodori Comics)

Isekai Harem Monogatari has been published digitally in English as Tales of a Harem in Another World by Irodori Comics.