Description

After Takumi and his sister Yui lost both of their parents in an accident 3 years ago, life is steadily going on for them and a close circle of friends.

One day, a new student transfers to their school.
This is the starting point for a subtle but actual change in their frozen time. Who am I?, What has happened in the past?
The beginning of summer holds the key to unveil these questions...

[From Wikipedia]