In the game you are a high school student who's living alone.It's August and you're on vacation but there is extra lesson in the school. You have a crush classmate but there's no intimate relation yet.
One day an unexpected happening occurs. A clone-making-machine appears in your house which is sent perhaps from future. And you get a hair of your beloved. Then you attempt making her clone with it at home.

[From Anime Densetsu]