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Nozomi Mori, whose full name appears in Chapter 415, is the diligent Vice President of Eiryou High School's Student Council. As a second-year student, she speaks politely yet shifts to a notably rougher, more casual tone when agitated or flustered, mirroring Takatoshi Tsuda's speech pattern. Her appearance features light brown hair styled with long bangs and a top knot, along with notably large breasts that drew immediate attention upon her debut. She typically wears Eiryou's winter uniform sweater.

Mori first appears in Chapter 300, assisting Shino Amakusa during a temporary school swap with Eiryou's president, Chihiro Uomi. While initially praising her own council, she quickly recognizes Shino's eccentricities rival Uomi's. Uomi explicitly designates Mori "Eiryou's Tsukkomi" for her role as the rational straight woman countering Uomi's provocations, mirroring Takatoshi's function at Ousai Academy; the manga author labels her a "Takatoshi-Class Tsukkomi," highlighting her quick wit.

Her interactions with the Ousai Student Council showcase her abilities. During a joint trip in Chapter 308, her strong tsukkomi reaction to Shino and Uomi's mud bath antics—loudly chastising them for shaping mud resembling semen—impresses Takatoshi in the adjacent bath. In Chapter 315, she inadvertently surpasses Shino and Uomi in perceived romantic progress by casually obtaining Takatoshi's home address, prompting them to declare her "30 points ahead."

Recurring comedic misunderstandings involve Takatoshi. Returning a key to him on Uomi's behalf in Chapter 304, her phrasing about Uomi "being late" is misheard by eavesdroppers as an invitation for a night together. In Chapter 320, Takatoshi and Shino discover her partially changed in Takatoshi's living room after Uomi misled her about the location. When she privately asks Takatoshi to keep it secret, their agreement to treat it as "our secret" fuels persistent rumors.

Mori faces personal challenges, notably reluctance to swim due to self-consciousness about her body. In Chapter 328, Uomi arranges practice at Ousai's pool. Through persistent effort in Chapter 329, she regains swimming confidence, though classmates frequently observe her physical development, particularly her chest. Her "snow girl" trait, causing snowfall when visiting snowy regions, emerges during a Chapter 309 trip where she and Takatoshi jointly tsukkomi Uomi's nonsensical "frost girl" claim.

Her interactions often highlight unawareness of how others perceive her rapport with Takatoshi. During a Chapter 351 theater performance, Ranko Hata manipulates audio to imply Mori disrupts a kiss scene out of jealousy, sparking audience speculation. In Chapter 361, Uomi accuses her of intentionally coordinating outfits after she loans Takatoshi gloves during park cleanup, oblivious such actions could be seen as romantic pairing.

Mori appears in animated adaptations including the April 15, 2016 OAD, subsequent OVAs, films, and Season 2 episodes, adapting these manga arcs. She consistently serves as Eiryou's primary tsukkomi, balancing professionalism with comedic frustration confronting Uomi or the Ousai Council's antics, defined by her diligence, situational unawareness, and dynamic as Uomi's straight-man counterpart.