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Sansui died and was taken to god, where he explains that due to his mistake he killed Sansui, and as an apologize god said that he would reincarnate him in another world with the power he desires. Sansui desire to be the strongest in the world, but soon realizes that his desire may be the most difficult test of his life.
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 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 people’s 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, he’s ‘the Strongest’ but he looks simple. With an ordinary wooden sword in hand, the fight of the simple-looking Sword Saint has just begun.