Based on the erotic game by Shelf.

The story takes place in a small village. A girl, Ajisai, transferred to the village one month ago. The main character is Aoi. He always watches Ajisai being alone. One day, when he is at school, Ajisai tells him, "Let's play a game." Her offer changes everything around him.
Ajisai, Kaede, Kusanoou, and Sumire. The story goes as their thoughts mix with each other...

(Source: ErogeShop)