Summer's here! Not wanting to be cooped up in their dorms all summer doing homework, sophomore shrine maidens Kaede, Sanae, and Yuu, go outside to enjoy themselves and create some everlasting memories. However, those troublesome youkai are at it again, interfering with the summer festivities happening all over town. From the shining beaches to the brilliant fireworks display, it's up to our three heroines to prevent the youkai from ruining summer for everyone, all the while trying to enjoy themselves and put off homework a little bit longer in this action rhythm