Tane Wo Tsukeru Otoko

You're referring to the Japanese manga and anime series "Tane Wo Tsukeru Otoko" or also known as "The Man Who Leveled Himself"!

Synopsis: In a world where people are born with unique abilities known as "Jobs," the main protagonist, Hyoudou Issei, was one of the most ordinary people without any special abilities. However, after being killed by a powerful monster, he was reincarnated into a different world with an extremely powerful job - the "Pre-Evolution Job" which allowed him to evolve any job to its maximum level instantly. Tane Wo Tsukeru Otoko

Tane o Tsukeru Otoko is part of a specific lineage of games (including Suezen! ~Tane o Nozomu Kanojo~) that prioritize "impregnation" as a central gameplay mechanic and narrative goal. You're referring to the Japanese manga and anime

Part 1: The Linguistic Anatomy of the Seed

To understand the man, you must first understand the seed. In Japanese, tane is a wonderfully ambiguous word. It can mean a plant seed, the roe of a fish, the core of a problem, or—crucially—sperm. When used in the verb phrase tane wo tsukeru, the agricultural metaphor is intentional. The films of Yasujirō Ozu and Hirokazu Kore-eda,

One night, a young girl named Hana followed him. She watched as he knelt by the edge of the poisoned river. He didn't just drop a seed; he breathed on it first. He sang a low, vibrating hum that seemed to make the very air tremble. When he pressed the seed into the mud, a faint, emerald light flickered for a second before the darkness swallowed it.

The Main Heroine: Early in the story, Shinji enters a relationship with Kotori Fujiwara, a 15-year-old girl who agrees to help him fulfill his dying wish. Their relationship forms the emotional core of the game, contrasting the protagonist's cold, biological goal with genuine affection.

English Translation: The Man Who Leveled Himself