
Just a question, do you know which part of the novel, where yuri became the maou because sara betrayed him and he went on super maou mode? he had used his powers in the sea and fought big shimaron? Sara also lent yuri his jacket... which chapter ? Please help ive been looking for it.

Sara giving Yuuri his cloak - Novel 9, chapter 9. Yuuri also turns into the maou in this chapter - because of Wolfram, not because of Sara -
After this Yuuri goes into 'maou' mode only one more time, in Novel 13, chapter 3.
He also manipulates water in Novel 14, chapter 6, but he's not really in maou mode.
Crazy how it twists ones mind