Tomomi Takahashi, known to friends as "Tomo-chan" or "Tomo," serves as elementary school class president. She sports a distinctive black bob hairstyle and glasses. Her close friends are Azusa "Azuki" Noyama, Kaoru Nishino, and Midori "Jidama" Kodama.

Tomomi harbors romantic feelings for Makoto Sakaguchi, a wealthy but unspoiled friend of Yūnosuke Ogasawara. Initially unaware of her affection, Makoto eventually invites her on a date to his family's hotel, where they grow closer. She co-founded the "Club of Unreturned Love" or "One-Sided Love" with Azuki and Kaoru, sharing experiences of unrequited crushes.

Responsible and mature, Tomomi aspires to be a teacher like her mother and older brother, Shinichi. She shares a close bond with her younger sister, Yuka. Her mother sometimes teases her about her responsible nature, which Tomomi typically downplays. Her interests include reading, writing, and enjoying classical piano music.