The value on this game is the dialogue since the publisher are japanese visual novel maker "key"
So if you don't understand japanese you may not enjoy it too much.
You can complete this game in a couple of hours, no need to grind many SS character, I've already completed the the game with only 3 SS character with average level 30.
Overall I enjoy the game and music, but after few days you got nothing to do except collecting waifus.
This game won't give u addiction, i suggest you to try it