I Wanted to Be a Shop Manager, But I Ended Up Becoming a Swordsman

Mitsunari's soul is transported to Tokyo, where he becomes an ordinary high school student.

The mother left home, leaving behind 200,000 yen, a martial arts equipment shop, and a lovely younger sister.

The yen changed from paper money to coins, the martial arts equipment store was on the verge of bankruptcy, and the younger sister was clamoring to drop out of school.

Left with no other choice, Sancheng rolled up his sleeves and became the store manager.

My goal is to become the most stylish store manager in Tokyo!

......

Years later, Mitsunari was given the title of "Reiwa Sword Saint" and became famous throughout Japan.

How did I, a mere bamboo sword seller, become a sword saint?

There must be some mistake here!