If you're looking for manga similar to Hoozuki no Reitetsu, you might like these titles. All recommendations are made by Anime-Planet users like you!
The land of the dead is a heavily bureaucratic place full of paperwork, and it is the job of the shinigami (death gods) to ensure that the dead stay dead and in their assigned locations. Tsuzuki Asato is one of the longest serving shinigami, but is somewhat flaky and difficult to work with. He is assigned a new partner, a rookie shinigami named Kurosaki Hisoka, who seems to be the complete opposite of Tsuzuki in personality. As the two begin investigating various cases they become entangled in the plots of the mysterious Dr. Muraki Kazutaka who seems to have something to do with Hisoka's past. Life is never dull in the afterlife as Tsuzuki and Hisoka deal with Muraki's antics, their growing relationship, and Tzusuki's own dark, mysterious past that continues to haunt him.
Saint Oniisan is slice-of-life, or divine-life, tale of Jesus and Buddha as they try to experience the modern world: in this case, Japan. The manga places a funny twist on religion, attitudes, culture and customs in Japan through the eyes of Jesus and Buddha. You see Jesus and Buddha experiencing Asakusa, public baths, theme parks, and the internet. Throughout the manga, we get a little history of their divine greatness only to see their apparent insignificance in modern Japanese society. Suffice to say, before people can recognize that they’re actually Jesus and Buddha, people think of them as someone who looks like Johnny Depp or a guy with a button on his forehead. For real.
Both of these series are comedies featuring various characters from various religions and folklore. One stars Jesus and the Buddha taking a break from Heaven as roommates in Japan, the other involves workers employed under King Enma in Japanese Hell.