Yui Kurata

Yui is a special mage, so she can only communicate with others through dreams. She also lives in the dungeon underneath the academy. After she was rescued from Arata and Others Trinity Seven(except for Lieselotte to disappearance) Yui can return to a normal life with other people her and Levi as Close friends much. She has a character little sister style so close with Arata like a big brother. Yui is a Trinity Seven too.

History
Yui is a mage who lives in the dream world, with dream being her thema. She was sealed because being asleep was part of her thema research. Her power is in the cardinal class (next after the headmaster) and without her restraints her magic has the dangerous potential of causing the entire world to fall asleep.

Story
Arata met her when she saved him from being killed by Akio to stop the breakdown phenomenon. She pulled him into the dream world at the last moment. There she introduced herself, and explained to him what archives and themas were.

Because Arata met with her, the power of the magic king affected her. Causing the entire school to go to sleep.

Abilities
Stary Night Serenade

Trivia

 * Yui rarely ever shows up at school.