Jimi na Kensei wa Soredemo Saikyou desu

A Japanese student named Shirokuro Sansui died because of God's mistake and was teleported to a different world. He claimed that he wishes to become 'the strongest,' so he received a referral letter addressed to a sage from God and 500 years of training from the sage. When he reached a stage where he could be called 'the strongest' in the common people's standard, he stumbles upon a baby near his training grounds, and there, he finally starts his adventure in another world. His training was simp...