|Spoiler Alert: This page contains spoilers. Read at your own risk.|
|Full Name||Tsukuba Yuuka|
|School|| First High School |
|Novel||Volume 16, Chapter 2|
Tsukuba Yuuka (津久葉 夕歌) is one of the candidates to be the next Head of the Yotsuba Family.
Appearance and PersonalityEdit
She qualifies as a very cute or pretty young lady. She has habits and etiquette that makes some Yotsuba servants annoyed with her.
Since Yuuka is a powerful Mental Interference magic user, she gets sent out on missions by the main house every now and then. She is also targeted for her genes, which have a high affinity for Mental Interference magic.
Yuuka lives away from her family on the condition that she wouldn't try to become the next clan head.
She weighs 48 kg.
Two years before the main story, Yuuka's family was pushing for her to become the next head of the Yotsuba, but they stopped doing so. They know Yuuka is unable to beat Shiba Miyuki in magical ability. Since then, they're all supporting Shiba Miyuki to become Maya's successor.
During her time as Vice-President, the President of the Student Council at the time proposed the theoretical development of a magic that could replace weapons of mass destruction but she was censored by the instructors. 
She lives in Tokyo.
- Type of Mental Interference Magic. Persons exposed to this magic will be a slave of their intense fear and their minds will be seriously debilitated regardless of their physical stamina.
She can force people to convey any information, including their own secrets with her magical abilities.