With some episodes included with the home video release, that makes this latest episode the 17th for the series.
The series stars Natsukawa Shiina as Nonoka Komiya, Inori Minase as Noel, Haruka Yoshimura as Shiiba Koharu, Kaito Ishikawa as Souta Mizusaka and Aki Toyosaki as Yuzuki Mizusaka.
To solve the riddle, Nonoka must join with her friends and rediscover the events that occurred before she left Lake Kiriya.