Death March kara Hajimaru Isekai Kyusoukyoku (WN) - Book 16 - 16-71. Saga Empire, Satou's Battle

Roy died during a war against the Evil God Cult, but somehow, he returned back in time to 30 years in the past where he was just a boy who awaken his summoning magic.

The mid-level boss of my company’s AAA-game.

For unknown reasons, he finds himself transported to a parallel world's Japan, unexpectedly taking over the body of a soon-to-be high school student who had died accidentally. Surprisingly, he did not inherit any memories. However, the first challenge he faces upon arriving here is a language barrier...Just as he struggles to communicate with his new family, a heavenly voice arrives: the black technology system has been activated, and the initial item—translation konjac—has been distributed.This is the story of someone with above-average intelligence but almost no physical strength in the Classroom of the Supreme Power.

Though it may be a dream weathered, crumpled, fading,I held on without surrender.Through each repeated day, running toward tomorrow’s light,I became a knight, resolute and bright.