二度転生した少年はSランク冒険者として平穏に過ごす～前世が賢者で英雄だったボクは来世では地味に生きる～•Nido Tensei shita Shounen wa S-Rank Boukensha Toshite Heion ni Sugosu: Zense ga Kenja de Eiyuu Datta Boku wa Raise dewa Jimi ni Ikiru

The Re-Reincarnated Boy Lives Peacefully as an S-Rank Adventurer: I, a Sage and Hero in My Previous Lives, Will Live a Simple Life in My Next

"I was reincarnated again." Rex, a reincarnated boy with two past lives—a "Sage" and a "Hero." Having learned the dangers of standing out from the memories of those lives, he vows to live a simple third life as an "Adventurer." But that "simple" was way too "fancy" for normal people!! So begins the exciting fantasy adventure drama of the strongest boy with no self-awareness, overwhelming the people around him in his super new game plus!! (Source: Square Enix)