MTL - Apocalypse Summoner - Chapter 1644 Finale (below)

Reborn into a magical world after a life of misery, Kael gains a unique power... The ability to steal the souls of those he kills and, more intriguingly, collect the souls of the most beautiful and sensual women in the world.On his hunting journey, he transforms his body from weak to unbeatable, while building a harem of stunning souls.________________Additional tags: Fantasy - Adventure - Action - Romance - Harem - R18 - No NTR - No Yuri - Weak to Strong - Bloodlines - Evolution

Dropped

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.

I returned after 10 years.