That time I was reincarnated as the Striped Emperor

Lagos Leonide and his girlfriend Satoura Mikami got in an car crash with only Lagos surviving. He got depressed and as he was on the verge of death, he sudently awoken in a strange cave with a new appearance and powers. He overheard a couple of adventurers saying something about a village and a slime they met named Rimara Mikami. If his suspicions were correct then he has only one objective right now find his reincarnated girlfriend and live happily ever after.