Mina Hayase is a female character originating from adult-oriented media. She possesses green eyes and distinctive pink or red hair styled in a ponytail with spiky bangs and twin ahoge, frequently accessorized with a hair ribbon. Her height is 162 centimeters, with body measurements of 88-61-88 centimeters, resulting in a slim build and notable bust size. Her typical attire features school uniforms or related outfits, often including elements like pleated skirts, knee-high socks, loafers, and ribbon ties.

Academically, Mina attends high school as an eleventh-grade student, consistently ranking 50th among her 300 peers. She demonstrates proficiency in English, mathematics, and modern Japanese, while showing less aptitude or interest in art, classical literature, and home economics. Her personality is lively and approachable. Her primary narrative function centers on initiating and maintaining a non-romantic sexual relationship with her classmate, Tomohiro Takabe. Their interactions begin with a sexual encounter in the school nurse's office and establish a recurring pattern of casual physical involvement.

Mina approaches relationships emphasizing physical gratification without emotional commitment, contrasting with Takabe's eventual desire for conventional romance. This dynamic expands when another student, Kaori Nonomiya, discovers their relationship and participates in a threesome arrangement. Beyond these interactions, no significant character development or background story exists across related media. Her depiction extends to merchandise, including a discontinued collectible figure highlighting her physical attributes.