Naruto: I Practice Tai Chi and Travel Through the Ninja World to Practice Tai Chi.

No system+Hyuuga clan+Genius boy The protagonist, who was frail and sick since childhood, learned the ancient breathing and breathing method and practiced Tai Chi to strengthen his body for more than ten years. In middle age, he accidentally traveled to the world of Naruto and used the Tai Chi and breathing exercises he had practiced in his previous life for more than ten years to slowly become stronger and change the ninja world.