“It’s summer vacation and your parents are heading overseas for work, leaving you with your 5 little sisters: typical lovestruck imouto Aya, modern tsundere Rio, timid and shy Hiyori, lively and perverted Koharu, and the bookworm Michika who’s a lovable sadist. With no distractions and ecchi happenings one after the other, how far will you go with them?”
Yeah, I can see why.
Is Ghostfacekiller aware of this? Apparently they’re all blood-related (which he likes), but unless the girls are twins, triplets, quadruplets, or even quintuplets, some of the girls are probably going to be pretty young, maybe even lolis (which he really likes).