Oikawa Naoki is a student that only lives to masturbate. One day, he suddenly gets summoned to another world by 3 beautiful girls that call him a hero. In this world, his semen increases the combat power of women… can he handle all the attention and sex?
Isekai Harem Monogatari 4

Summary
Isekai Harem Monogatari, 異世界ハーレム物語, Tales of A Harem in Another World, 이세계 하렘 이야기, Contes orgiaques dans un monde fantastique, История о гареме из другого мира
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