Kisa Kondo is a supporting character in the series. She is known for her short haircut, which makes her easily recognizable among the cast. Her role in the story is primarily defined by her relationship with professional baseball player Retto Mitsui, a left-handed starting pitcher for the Motor Suns team, of whom she is the girlfriend.

Personality-wise, Kisa is depicted as a lively and supportive individual. She consistently cheers for Mitsui from the stands and looks for ways to show her care for him and the team, often turning potential disappointments into positive moments. This aspect of her character is highlighted in a key episode where she participates in a friendly competition with Yuki Takino. When special player collaboration lunch boxes for Mitsui and another player, Kojiro, do not sell, Kisa and Yuki engage in a contest to see who can eat the unsold lunch boxes first, each wanting to support her respective partner in a unique and devoted way.

Kisa's primary relationship is with Retto Mitsui, and her actions are motivated by her desire to support him. Her role in the story creates an interesting parallel to Yuki Takino, as both women secretly support their baseball player partners, leading to an amusing and competitive, yet friendly, rivalry during the lunchbox incident. Through this event, Kisa demonstrates her ability to create a fun and supportive atmosphere, showcasing her caring nature and her devotion to her boyfriend and the team's community.