Saint☆Oniisan (Movie)

Both have a unique yet light-hearted comedic setting. 

historical figures from ancient times enjoying mundanity of modern japan, while referencing legendary episodes from their previous lives in all sorts of comedic contexts. both are very lighthearted and enjoyable. 

If you liked the pure-hearted comedy and slice of life aspect of Nichijou, you might like this as well. Some might think the art style is a bit peculiar, but if you can get past it, this is a highly enjoyable anime. 

Both are comedies which take roots in religion. While Hoozuki no Reitetsu is about hell as viewed in Japan, Saint Onii-san is about Buddha and Jesus. 

While on the surface, Saint Oniisan and OPM have little in common, their comedic pacing and nature as slice-of-life [bromance] comedies starring unusual super-human characters give a similar vibe. Saint Oniisan lacks action, fighting, or even much of a plot, but the premise of Jesus and Buddha rooming together in a Japanese apartment and dealing with the extraordinary comedic situations their powers put them in is very similar to the core dynamic of Saitama and Genos. If you are drawn into One Punch Man for its comedy and novelty factor, and are looking for a fun, silly film that is equally as original in its concept, Saint Oniisan is worth a watch or two. read more