It has a great story. It is actually pretty linear, and very few scenes (very few development scenes, H-scene, and the epilogue) change when going for different girls. The writing is also excellent, with a lot of 4th wall breaking.

It has a bit of action, a lot of excitement, and a good dose of drama. I don't want to go into details because it might spoil you, but it is definitely a must play VN.

EDIT: Oh, and I forgot to mention that it has one of the most interesting and original premises I have encountered in fiction.