The protagonist is Hiruho, who pursues immortality.
He has memories from several lives. He was once an ordinary office worker in modern society in his twenties, and he was also a researcher at Silph Co. in the Pokémon World.
He is a close friend of the Sannin, one of the founders of Konoha's medical system, a developer of scientific ninja tools, and Konoha's Minister of Transportation.
The gene-enhancing drugs he developed brought the glory of Wood Release back to Konoha, where everyone became a Wood Release user.
He does not crave fame, fortune, or power, and keeps a low profile. His only obsession is pursuing eternal life.
