A manga adaptation with art by Shidō Yuutarō has been serialized online via Kadokawa Shoten's Young Ace Up website since February 2020.

Even though he practices all day, Allen Rodol is on the verge of flunking out of Grand Swordcraft Academy due to his total lack of talent.

To make matters worse, class prodigy Doriel, challenges him to a duel where it's win or face expulsion.

However, the night before his duel, a mysterious hermit grants him a button that will give him one hundred million years to train in an alternate reality when pressed.

[4] A manga adaptation with art by Shidō Yuutarō has been serialized online via Kadokawa Shoten's Young Ace Up website since February 2020.