Tsugumi Gotou (also spelled Godo) stands as Maki Hoshikawa's closest friend, fiercely protective of her. She initially greets the protagonist with hostility due to their connection to Maki, though this stance can mellow if he pursues a relationship with her. Academically gifted in language and literature, she is a frequent presence in the school library and a member of the literature club, planning to continue her studies in this field after graduation.

Despite her scholastic strengths, she struggles athletically. Her personality defies the typical studious mold, marked instead by a morose, sulky nature and a quick temper. She displays surprising bravery when confronting threats to Maki, such as thugs. These traits cement her role as the series' tsundere archetype; her "Tsun" special skill directly impacts gameplay by rapidly draining motivation stats.

Her personal journey focuses on growth, learning to accept that she cannot always protect Maki and that both must lead separate lives. This development includes moments where she warms to the protagonist, highlighted by a "Jealousy Event" triggered if he visits her workplace accompanied by another girl, showcasing her emotional complexity and capacity for jealousy.

Physically, she possesses orange hair, green eyes, stands 155 cm tall, and has measurements of 78-54-78 cm. Her attire includes glasses, school uniforms, swimsuits, kimonos, and the maid outfit from her cafe job. Books are her signature accessory, and she practices unarmed fighting. Her background includes working as waitstaff, where her maid uniform is prominent.