As for the gameplay itself, it's not that great, fun but kinda boring. I don't know, I've experienced many gameplay but this type of gameplay is what makes me bored faster than the other so it's not for me in that sense. Decent I would say.
Storyline? If you don't skip any, you will forget that this was actually RPG game because the story was almost like Visual Novel, I would say one section was equal to one to two chapter of manga. It was great, so many interaction between the heroine and the player, pretty interactive too with player given a selection to respond for every single conversation as far as I played (only played to Section 8 as of now).
Yes, like many people, this game is laggy everytime a character model appear on screen (not on battle or main menu). Also, I don't know what I missed or I did wrong, I participate the pre-registration and yet I've seen no reward. Only thing I encounter was those login reward, I don't pretty much pay attention to the gift box but there could be a possibility I claimed the content without realizing it was actually pre-registration reward thinking it was login reward.
Played less than 5 hours as I write this review, not sure if this worth the shot to spend the time on, but I'm pretty sure I won't play this in the long run. Quickly bored, nothing much to do, so yeah, I planned to quit and uninstall in the very near upcoming days.
To take a note, after tutorial (if you didn't skip it) it will ask to download additional data with 1.7 GB size. If you could read and understand Japanese, the story was great, so that's the extra point for this game. If not, you'll pretty much be like me, getting bored quickly. Have fun playing!