"On Tanabata, Orihime and Hikoboshi definitely have sex."
She muttered, while looking at the fireworks that ended the festival in August.
The protagonist Ryou came to the festival alone in order to remember his girlfriend, who died two years ago in an incident... but ended up having sex with his classmate Kunimi Saya, whom he met by chance. Her face, reflected by the fireworks in the middle of the dark forest, was quite sad.
A small incident happened sometime after the festival - somebody had been drawing graffiti all over buildings and parking lots without permission. Because one of the places happened to be related to his former lover, Ryou went to check out it, only to find Saya there, but there was something completely different about her...