The protagonist, Yuuri Izumi, one day loses his life due to a certain event and undergoes reincarnation in another world. However, according to the goddess, Yuuri’s magic power is zero. She is told that he is too fragile to survive in the other world.

Therefore, before reincarnating into the other world, Yuuri decides to receive time for training. But, due to a mistake by the goddess, he ends up training for 1000 years, even though he was supposed to train until he became a lowly swordsman.

Yuuri becomes the world’s strongest after 1000 years of training. But he mistakenly believes that he has finally become a lowly swordsman and sets off on a journey to the other world.

There, Yuuri mistakes a Fenrir for mere dog. Mistakes the strongest dragon for a mere bird and instantaneously defeats it, and discreetly saves a S-rank party of beautiful girls renowned throughout the country.

This is a story of the strongest swordsman without magic power, engaging in unconsciously overwhelming battles.

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