Niihiko

A former corporate slave of a black company, Hayasaka Renshou, collapses while on his way to work a triple shift and gets reincarnated into a different world. In this new world, he is known as Zeno and possesses a blood seal (Stigma = a special ability granted to humans). However, no matter how hard he tries, Zeno's motivation hits zero after realizing the truth of constantly going back and forth between his previous life and the other world upon death...!?