Haramasete Seiryuu-kun - Episode 1

The main character has high-quality genes, and the girls around him are on the hunt for him. The genes are collected naturally, the girls get them through the guy's penis. There are a lot of girls, and all of them want to get pregnant by him. But among this crowd of girls, there are two favorites, the former classmate Natsuki and her childhood friend. They used to be best friends, but now they are fighting a tough war for the right to be the first to get pregnant by Seiryu, the protagonist.