Bad news: Deus Ex Machina is a load-bearing God. As he reaches the end of his life, reality starts to break down.
Akise breaches the gates of heaven to confront Deus. But Deus says that he isn't even real - he's an Observation Terminal for Deus to keep tabs on the diary keepers.
But Akise disagrees. Observers may only observe, but he's used Eighth's power to give himself a Future Diary, and he intends to use it to save Amano.
--
Akise and Amano's friends betray him and help Eighth escape. Akise fights Gasai to a standstill.