Grisaia no Kajitsu is amazing, but I've still got Makina's route to do before I'm done. It has the best cast and drama I've seen in a VN, although Sachi's bad end was forced as hell. It wrecked my enjoyment of the route, but she wasn't an interesting character to start off anyway.
Route rankings so far:
Mitcher > Yumiko > Amane > Sachi
Girls:
Yumiko > Mitcher > Amane > Makina > Sachi
I've started off NG+ of Yumina, too, but the shortage of h-scenes is awful. Even if I get all of the debate heroines' scenes, I'll be disappointed with the quality and tameness of them. I like how it basically becomes Super Robot Wars once the space ark begins, with the fan-fiction tier plot and mechs. At least it offers more challenging/rewarding gameplay than SRW (barring A Portable. That shit's pretty hard), as well as being more balanced. If you're paying attention to the audience bars/changes of attacks, or you're grinding hard, then this game can get pretty easy. The final bosses were disappointingly easy, but I'm playing on hard mode now so I'm hoping for more challenge.