Countdown 7 Days GN Vol 01 (MR)

Onigawara Hanasuke finally realized that he had died-when Mitamura, a dark haired & glasses guy from "another world" told him so. Shocked and saddened from the news...But Mitamura lets him in on a little trick, that he could revive himself. Sounds like a great story but in exchange, asks him to help Mitamura to find some and he only has 7 days to do it...