Jinsei Dakkan ~Subete o Ushinatta Zaibatsuka no Musuko~

Kai Kanaya, the eldest son of one of Japan's wealthiest conglomerate families, loses everything when a man named Yoshifumi Ato appears, claiming to be the true heir. Stripped of his wealth, status, and identity, Kai is cast into despair—until a fatal truck accident seemingly ends his life. But when he awakens in another man's body, he realizes this is his second chance. From the ashes of ruin, the disinherited heir begins his rise to reclaim everything that was stolen from him!

[Original Webtoon](https://jp.piccoma.com/web/product/188530)