Countdown 7 Days Vol. 3 (manga)

Onigawara doesn't really want to learn about being dead. He wants to collect on the deal he made with teacher Mitamura: complete the set task within seven days and he gets his life back. The clock is ticking, but there is one thing Onigawara is as yet unaware of... once you're dead, you stay that way.

The tasks given just seem to get harder and harder, and things keep spinning out of control. And it's not just Onigawara who in trouble when it does...