Tsukimi Kurashita is an 18-year-old aspiring illustrator living as a NEET in Tokyo's all-female Amamizukan apartment building, having moved from Kagoshima. She occasionally reverts to her Kagoshima dialect under stress. Her appearance features fair skin, long black hair usually in plaits, freckles, and red-framed glasses. She dresses plainly in unstylish clothing such as grey sweatsuits or knee-length skirts with jumpers. Her profound obsession with jellyfish started in childhood after an aquarium visit with her mother, who likened jellyfish filaments to princess dresses. This connection deepened following her mother's death, contributing to Tsukimi's withdrawn personality and social anxiety. She fears interactions with men, attractive people ("Stylish"), and formal work, often freezing or suffering nosebleeds in stressful situations. She possesses encyclopedic jellyfish knowledge and keeps a pet spotted jellyfish named Clara. Tsukimi exhibits low self-esteem, frequently calling herself "ugly." Despite this, she is kindhearted, assisting her housemates (the "Sisterhood" or "Amars") with chores and buying them gifts using funds from her father. Her personality combines innocence, naivety, and a youthful spirit, though she retreats into her mind to process emotions. Her life changes upon meeting Kuranosuke Koibuchi, who cross-dresses as a woman. She becomes the sole resident aware of his true gender, forging a secret friendship. Kuranosuke gives her makeovers, revealing she "cleans up nicely" into a conventionally attractive woman with raven hair and ivory skin. This altered appearance attracts Shu Koibuchi (Kuranosuke's brother), who initially fails to recognize her. She develops romantic feelings for Shu, though misunderstandings about his relationship with developer Shōko Inari cause distress. In the manga, they date and agree to marry, but Tsukimi later calls off the engagement after relocating to Singapore temporarily to save Amamizukan from redevelopment. The live-action film hints she may choose Kuranosuke instead. Tsukimi evolves from passivity to assertiveness. She designs jellyfish-inspired dresses, channeling her artistic skills and otaku passion into fashion. This culminates in collaborative efforts to fundraise for Amamizukan's preservation, including a flea market and fashion show. She increasingly challenges her anxieties, confronting stylish salespeople or negotiating business deals. Her motivations shift from self-preservation to protecting her community, exemplified by sacrificing her comfort to secure Amamizukan's safety. By the manga's conclusion, she prioritizes her design career over marriage, seeking self-sufficiency. Key traits include her name's etymology ("moon" and "sea," reversing to "kurage" or jellyfish), poor eyesight enabling avoidance of nudity, and conversations with her deceased mother for guidance. Her jellyfish obsession metaphorizes her desire for a gentle, judgment-free existence.