Immortal Terminator

A programmer died suddenly due to overtime work and returned to his junior high school days. Is this a bloody rebirth? Is it an unconscious dream? Maybe not... Immortality has always been the ideal of mankind. On the road to pursuing immortality, people have opened up one path after another, but some people even choose ways to benefit themselves at the expense of others. Our protagonist is the terminator who destroys these immortality plans... Each enigmatic whirlpool is waiting for us to uncover its mystery.