Why are there those som muhc ero insinuating posters at the end of chapters?
Is the author pushing those to increase the nr of readers by applying blatant fanservice?
@happybro you mean the "Sample" pictures? They're gifts depending on where you buy the manga from. Buy the manga from toranoana and you get a schoolgirl maou poster, buy it from Comic Zin and you get a nightgown one, etc.
They do this with other mangas too, Tomo-Chan comes to mind first.