一億年ボタンを連打した俺は、気付いたら最強になっていた～落第剣士の学院無双～ (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…