Yuki decides to visit his father with Yuno to retrieve a telescope, but when Yuno decides she knows best for her future husband, she kidnaps him. Now Akise, Hinata, Mao, and Kousuke to save their friend from a psychopathic stalker.

Yuki's friends are caught in a death trap and Yuno? She's forgotten who any of them are. However, she hasn't forgotten how to get and keep the upper hand. A ray of hope arrives in the form of a Diary, but remember, every Diary has its limits.

After a futile attempt at discarding Yuno, Yuki is faced with trying to overcome his weakness and fend for himself. The gang takes refuge at Kousuke's manor. The Diaries of Exchange reveal themselves for a battle between lovers.