Well...umm...i'm trying to be original here so...HA! which among the girlfriends you like the least?
Probably Kurumi she has a pretty one note personality but that being said all the characters are so well written with jokes and interactions with rentarou it was hard to pick a least favourite
I can't pick the least favourite as everyone has it's own characteristic and lovely in its own way. But if I really had to say one it might be Kusuri.
What do you think?