I think the prize for most insane shit hidden behind a innocuous summary goes to the manga Rosen Garten Saga.
After her village was attacked by a band of thieves, Rin has risen to protect her friends and the world with the help of a Magic Sword, which contains the soul of a hero� A fantasy/action story featuring an unprecedented heroine (?)
What I have witnessed in a span of just 5 chapters:
-Old man being ass raped onscreen
-MCās magic swordā¦turns her male enemies into women then gives MC (a girl) a dick so she can go rape them
-Bestiality, by means of a dude fucking a dragon
-Also a lot of orgies and a masochist but eh thatās vanilla