Summary from Iskultrip Scans:

It is a very dark night. Under a heavy rain, a determined man sets out to track his terrified victim. The decision of Kirishima Seiichi is clear: Tonight, he will kill his wife.

A year ago, he was a happy man - a successful writer, a contented husband, and a father of a young boy... at that time, everything seemed going well for him. But such happiness had to end. The day his editor put an end to their collaboration, darkness seeped into his life faster than a bullet. A terrifying descent into hell commences, page by page of what it seems to be his last novel...