Thanks for the insight. Gotta post something there too.
Nah mate, Mai-chan is a light story compared to that in part because it is a (dark) comedy from start to end. Meanwhile, the first story in that book depicted an amputee girl eating petrified feces infested with maggots from her sister's asshole while people from other locations were killing themselves attempting to remove endless amounts of petrified shit from their insides, with some of them going as far as opening their stomachs and anuses to get the shit out of them, all narrated in a completely serious way.
If it helps to identify the book, the infamous story of the girl who develops disgusting holes all over her body and ends inserting all kinds of objects in them is part of the compilation.