Reincarnated as an Alchemist - Rewrite

Sakagami Kazuma, a gacha-obsessed newly-graduated scientist, died in a localized disaster on the way home. However, at the moment he opened his eyes once again, he found himself reincarnated as a baby named Ren Concerto. Being reincarnated with his memories intact, he tried to adapt to his new life without knowing tha...