Hello! Demo version includes 1/3 part of the game. Adult scenes exists only in full commercial version.
sorry for the late reply but can I ask two more question?
1.Is this VN completed?
2.do I need to buy it again if it's updated?
This VN is a completed story, but we plan to release an additional story as an update next year, with new adult scenes ;)
And improved English translation.
No, you will get all updates of the game anyway.