Yamagiwa Mieko

She is one of the instructors who is the primary one in charge of the main character. A nice buddy sister with big breasts.
Usually, she has a dynamic and cheerful personality, such as flying the lower neta father gag often, but she is scary if she gets angry because she is a former Yankee. Her hobby is alcohol. When she gets drunk, she gets entangled and takes off. She hates being cramped, and the chest of her uniform is always open. No bra is her policy. She looks disrespectful, but basically serious about work. She is good at making fun of Shiori and Akemi, but she seems to be a little averse to poking fun at Sae.