|Японское имя:||筑前 優鳥|
Blood Type: AB
Yutori Chikuzen is a senior of Class 13 and a former member of the Flask Plan's Plus Six. Her project name is Trick or Treatment.
Chikuzen is one of the more mysterious members of the Flask Plan, even by the standards of the Plus Six. When introducing herself, she adds "...I think." after her name. Like the other members, she also adds "Let's try and get along." after her introduction. Like the other members of the Plus Six, she is considered a basis for Class -13, having a personality that separated her even from other Abnormals. She speaks with a rural dialect.
Voiced by: Hiro Nakajima