I’ll be honest, I don’t remember Yuasa Shoko from the Hyouka anime and I’ve watched it several times (I really like the art style). But it’s still an awesome book.
Basically, “Vagina Research Club” is a synonym for “Rape Club”. Yuasa and Irisu do all sorts of fucked up things in the name of “research”, and just when she thinks she’s about to graduate and get out they get her knocked up. Nice.
Translated by Doujins.com: EXHentai