|Hair colour:||Dark violet|
|Occupation(s):||High school student (second-year)|
|Affiliation(s):||Sanada Central High|
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Yanagin is a member of the High School Girls are Funky trio.
She is the bespectacled and tomboyish girl of the group. She is good academically and proficient in karate, full of crazy ideas and prone to violent outbursts. She was once part of the elementary school's strongest warriors to fight against the 'Archdemon'. She now attends Sanada Central High.
When in junior school, Yanagin was well-acquainted with Karasawa. After he was injured badly by the Archdemon, she asked to join the team that planned to take her down. Being quite tall for her age and proficient at karate, she was made a part of the team.
During the battle, she was taken out by the Archdemon. She woke up towards the end, along with Rubber Shooter, to find that the entire team had been vanquished. However, their opponent had passed out as well.
After the battle, she was selected to monitor Habara and ended up being friends with her until high school.