Replayed it for the third time, and I think I'll be stopping there for awhile. The story was intriguing and I liked the majority of the characters (except for Midori and Keisuke, ugh D:<). I love games with multiple routes, so this obviously has some great replay value. The boss battles are quite challenging on the last day too, depending on which ending you decide on. All in all, it was addictively fun<3
However if you want a good challenge, I suggest that you don't choose Yuzu's route. While it's kind of ideal for the first playthrough (fastest, easiest route of all of them), the ending was rather lame and depressing. D;