When I woke up, I had become a small fish. He is a nameless man who suddenly reincarnated in another world leaving only the memory that he was a human in his previous life. In the despair of being reincarnated in a poor body, the man is told by the "voice of heaven" that echoes in his head that if he accumulates various experiences and evolves, he will eventually become a dragon. The man (small fish) who became stronger as he gained experience points and suddenly became motivated to evolve, changed his mind from the "weakest" to the "strongest" and decided to take on an adventure in another world...! An unprecedented adventure to another world, sent by the tsukkomi-tempered protagonist!!