Pros:
- dragons
- bugless
- bits of biology, but not overly scientific

Cons:
- not many romanceable characters
- interactions between NPCs are rather shallow

Conclusion:

Story: We're sent to world where dragons live, to trade our PDAs for their generators in order to save humanity. Similar to Hatoful Boyfriend things are not as easy as they seem to be, and there is hidden ending. But in overall story is worse and more predictable than in HB. And playing through romances of all characters, in order to unlock true ending, was not really satisfying. There is no thrive that we learn something new about characters around us in every gameplay repeat.

Gameplay: It's visual novel with decisions and save system. Skipping already seen cut-scenes and dialogues works fine. Not much more to write here.

Graphic, music, bugs: Game is bugless, characters models and backgrounds are of high quality. Only problem is that characters do not have many poses, so they repeat really often. Music is more like ambient thing, nothing extraordinary