Jimina Ken Sei Wa Sore Demo Saikyoudesu

A Japanese student named Shirokuro Sansui died because of Gods mistake and was teleported to a different world
He claimed that he wishes to become the Strongest so he received a referral letter for a Sage from God and received 500 years of training
When he reached a stage where he could be called as the Strongest in the common peoples standard he picked up a baby near his training grounds and there he finally starts his isekai adventure
His training is simple his techniques are simple hes the Strongest but he looks simple
With an ordinary wooden sword in hand the fight of the simplelooking Sword Saint has just begun