Maki Amakasu, a close friend of Akira Koizumi, sports brown hair in frequent pigtails and blue eyes. She exhibits a high-strung, reactive personality, contrasting Ryoko Arigase’s calm demeanor, and escalates alongside group situations. Initially, she pities Keisuke Saji for relentlessly pursuing Koizumi despite rejections and physical altercations. Maki questions Koizumi’s unusual loss of composure around Saji, noting her friend’s uncharacteristic reactions.

Her view of Saji shifts as she discerns his hidden decency and good-hearted nature beneath his lecherous exterior. This evolution prompts Maki to occasionally aid Saji’s romantic advances toward Koizumi. Yet when Saji exhibits perverse behavior in her presence, she retaliates with physical aggression mirroring Koizumi’s treatment. Maki firmly believes Saji and Koizumi suit each other, actively championing their relationship through encouragement and engineered scenarios.

Maki’s family includes a mother and older sister, both police officers recognized for their prominent figures and tendency to draw male attention. This familial trait remains separate from her personal storylines. Within the group dynamic, she mediates the central relationship while supplying comic reactions to romantic tensions and misunderstandings.