Morita Momoko, 22, chases Hollywood dreams under the initials M.M., echoing her idol Marilyn Monroe as Japan's aspiring equivalent. She funds her ambitions through relentless auditions and part-time gigs like handing out leaflets in a bunny girl costume. Her unconventional upbringing included bathing with her father until high school, crediting these baths for her physique, which she shows no concern about discussing.

She wields a bold, manipulative personality, deploying strategic lies, crocodile tears, and emotional pleas to win. After Kentaro Minami accidentally costs her job, she invites herself into his home, bartering domestic chores and sexual favors for rent. Momoko displays zero inhibitions regarding nudity or sex, even floating adult video auditions as leverage—later admitting these were calculated provocations. Her persistence manifests in tactics like counting "boring sheep" relentlessly until Kentaro shares the bed.

She adopts a pet iguana, embodying her offbeat approach to life. Momoko further complicates Kentaro's world by invading his workplace, importing her assertive tactics into his professional sphere. While framing their bond as transactional, her actions reveal authentic concern for his well-being, starkly contrasting his fiancée Reiko's selfishness. She acknowledges her effortless lying with self-awareness, yet flashes vulnerability—like offering to vanish if truly unwanted, hinting at deeper attachment.

Her development oscillates between emotional manipulation and glimpses of resilience. She filters every entanglement through her acting ambitions, viewing life as perpetual self-reinvention. The story concludes ambiguously with Kentaro, Momoko maintaining a pragmatically open-ended stance, radiating confidence in facing future challenges solo.