Ichiokunen Button o Rendashita Ore wa, Kidzuitara Saikyou ni Natteita ~Rakudai Kenshi no Gakuin Musou~ (Associated Names)

There was a mysterious old man who approached the failed swordsman with the “100 million years button”. A magic button which can achieve the same effect as training for 100,000,000 years if you push it. The failed swordsman who pushed the button had his doubts, but immediately felt tremendous power rising in his body. So…