[Feel-Good Power Fantasy + Leveling Up + Japanese-Style Superpowered Martial Arts + Youth] After reuniting with his childhood friend from the martial arts world, whom he had not seen for years, Sanada Issei finally realized what a painfully wrong choice he had made by pursuing a white-collar career. After thirteen years, at thirty, he felt like he was seventy. After the same thirteen years, she still looked seventeen. He sat in an office while she studied martial arts. How could their lives have turned out so completely different? Unable to accept this fate, he was reborn! He returned to the vibrant age of seventeen. This time, he was determined to train in martial arts and strengthen his body. In this world where martial arts had returned, he would pursue the truth of life through strength! Would this life bring him love and romance, or battles across the land?
