Yuko Oshima (大島優子, Ōshima Yūko) is a C-Rank Keijo player under the Kansai's Hyougo Branch. She was a student at Setouchi Keijo Training School, the former top 10 examinee, and a resident of Room 104.
Oshima has side ponytail hairstyle. She is a huge, tall, and muscular woman.
Oshima is a friendly and playful person, and is able to get along with others within a short amount of time.
Episode 3 - Vacuum Butt Cannon!!!! Edit
Episode 4 - The Battle for the Fastest Butt!!!! Edit