I Activated Mount Fuji and Counted Down to 100 Days

In the parallel world of Japan, demons, monsters and strange people have been fighting for thousands of years in this small land. He Zai, who traveled through time, accidentally activated the system. As long as he kills monsters, he can become stronger! But the activation of the system has a small prerequisite that he doesn't know about... "Ahahaha... I didn't expect that activating the system would detonate Mount Fuji..." He Zai looked at the white-topped snow-capped mountains in front of him and scratched his head in embarrassment. "It's okay. It's not my country anyway. If it explodes, it will explode. As long as you return home quickly, everything will be fine!" [Friendly reminder: As long as you appear next to a person with special abilities, the other person will immediately understand that you are the culprit who activated Mount Fuji, and they will get the condition that as long as you kill you, the eruption of Mount Fuji can be stopped. "Nima!"