The manga adaptation of "Tsuyokute New Saga," illustrated by Jun Miura, has concluded with the release of Chapter 107, as announced by the publisher AlphaPolis.

The story centers on a world ravaged by a demonic invasion. The protagonist Kyle defeats the Demon King with his last remaining strength but is then sent four years into the past. Empowered by the memories and experiences of his former life, he seizes this second chance to prevent history from repeating its devastating course.

The manga, which has been serialized since February 2014, is based on the original story of the same name by Masayuki Abe. By October 2022, AlphaPolis had compiled and published ten volumes of the manga.

Abe began serializing his original story on the website Shōsetsuka ni Narō in 2012 and moved the series to AlphaPolis in 2013.

The novels have inspired a TV anime adaptation. Originally scheduled to premiere in July, the anime's release was delayed due to unspecified circumstances, and a new premiere date has yet to be announced.