Momoko Momono works as the assistant to private detective Kyousuke Mibuu, collaborating with him on investigations for several years. Initially characterized by cheerfulness, energy, and physical capability, she demonstrates martial arts proficiency through quick reflexes and strength. This is notably shown when she defends herself against harassment by forcefully slamming an assailant to the ground. Her martial arts training results in a fit, athletic physique. Visually, she possesses hip-length pink hair, green eyes, and notably large G-cup breasts, described as the largest among the cast. Her typical appearance includes a jacket, three-quarter pants, a necklace, and hair accessories like loops or ribbons, often exposing her midriff. Her relationship with Kyousuke forms a core background element. She harbors longstanding romantic feelings for him, evident in displays of jealousy when perceiving closeness between Kyousuke and other women, particularly Yukino Hongou. Momoko attempts to exclude Yukino from detective work, citing confidentiality, leading Kyousuke to reprimand her and defend Yukino. This romantic tension escalates significantly when Momoko discovers Kyousuke and Yukino engaged in a sexual relationship, causing her profound emotional distress and heartbreak. Kyousuke views Momoko as family rather than a romantic partner, deepening her sense of rejection. Their interactions include Kyousuke playfully teasing her about her breast size, to which she reacts physically, such as by kicking him, though they also share moments of laughter, indicating a complex bond beyond her unrequited feelings. Her interactions with other characters further define her role. She maintains a tense and jealous dynamic with Yukino Hongou, viewing her as a romantic rival. Her relationship with Mushizou starts antagonistically; she physically rebuffs his initial advance and labels him a pervert. However, this hostility turns catastrophic when Mushizou, exploiting her vulnerable state after the incident with Kyousuke and Yukino, kidnaps her. Following her kidnapping, Momoko's character undergoes drastic and tragic deterioration. Mushizou imprisons her in an apartment adjacent to Kyousuke's residence, subjecting her to prolonged and extreme torture. This includes repeated rape, drug injections, and physical mutilation: the amputation of both arms above the elbows and both legs above the knees, along with the gouging out of her right eye. Her physical degradation is compounded by psychological breakdown; initially strong-willed, she becomes depicted as broken, screaming, crying, and losing bodily control during the torture. Mushizou dehumanizes her, referring to her as an "animal," a "horny cow," and refusing to use her name, exploiting physiological traits like her wide uterus and heightened physical responsiveness to further degrade her. A supernatural element renders her existence imperceptible, preventing Kyousuke or others from hearing her screams or detecting her captivity despite the proximity. Her torture is foreshadowed in Kyousuke's prophetic dream, which envisions her mutilated and bandaged state. Her story concludes without recovery or rescue. After her kidnapping and the onset of torture, she effectively ceases to exist as an independent individual, reduced entirely to a victim under Mushizou's control, described as becoming merely a "plaything" or "toy." Her decline from a capable, hopeful assistant to a dehumanized object of torture marks her complete character trajectory.