Second Breath

When Kokushibo died, he knew he wouldn't have the luxury of seeing his brother again as Upper Moon one was certain he was going to Hell. Imagine his surprise when he woke up in the unfamiliar arms of a woman with navy blue hair, who was rasping out the unfamiliar title of 'Tsuki Amajiki.'

(This is a book inspired by Split Apart by little_daytime, a very good fic to read!)