Rainbow: Nisha RokubÅ no Shichinin
Has very dark themes and very similar to banana fish but it's more of a seinen than banana fish's shoujo
I haven't heard anyone ever talk about it to the point that I can't find anything about it in wallpaper engine (and I've found really unknown niche things there).
Ao3 had a total of 6 works of it, only one ......
