All the routes were amazing. But if i had to choose my fav...
Best Route: Amane -
Best Girl: Yumiko - I enjoyed her character development. Sachi's was better but i simply preferred Yumiko's.
Least Fav Route: Michiru - Michuru's route felt kinda sub-par compared to the others.
Least Fav Girl: Makina - simply because i'm not into Lolis Saw her more as a little sister during her route.