Marin is a second-year student at a co-ed high school in Japan, where she is well-liked for her cheerful nature and trendy fashion sense. While many perceive her as a typical “gyaru” due to her flashy appearance, Marin is actually a dedicated otaku, passionate about cosplay, eroge, and anime culture. She keeps this side of herself mostly private, fearing judgment from others until she meets someone who fully accepts her interests.

After discovering Gojo’s ability to craft intricate doll clothing, Marin reveals her desire to cosplay her favorite characters but admits she lacks the sewing skills to do so. Moved by her passion and sincerity, Gojo agrees to help, beginning a friendship and eventual romance centered around mutual support and personal growth.

Marin is known for her striking gyaru-style appearance: she has long blonde hair (often with pink highlights), pierced ears, and bright pinkish-red eyes. Her style includes trendy makeup, false eyelashes, and fashionable accessories. At school, she wears her uniform in a relaxed, personalized manner often pairing it with short skirts, oversized sweaters, and cute hair clips.

Despite her flashy appearance, her expressions are highly emotive, shifting from dazzling excitement to heartfelt sincerity in an instant. In cosplay, Marin transforms completely, adapting her makeup, posture, and demeanor to match any character, showcasing her incredible dedication to the craft.

Marin is bubbly, confident, and outspoken, often speaking her mind without hesitation. She has a strong sense of identity and refuses to hide her interests, even when they clash with others’ expectations. While she initially hides her otaku hobbies from her peers, she never feels ashamed of them instead, she longs for someone who will accept her as she is.

She is also kind-hearted, supportive, and emotionally intuitive, especially when it comes to Gojo. Marin immediately respects his passion for hina dolls and never mocks his interests, instead encouraging him to embrace them. Though she teases him playfully, she genuinely admires his skills and becomes a source of strength for him.

Marin is emotionally expressive and unafraid of showing vulnerability, especially as her feelings for Gojo deepen. Her ability to balance confidence with sincerity makes her a refreshingly multidimensional heroine.

• Discovering Gojo’s Talent
  Marin’s story begins when she accidentally walks in on Wakana Gojo using the school sewing room to craft traditional doll clothing. Instead of mocking him, Marin is fascinated and shares her dream of cosplaying her favorite game character, Shizuku-tan. She persuades Gojo to help her make the costume, marking the beginning of their creative partnership.

• Cosplay and Connection
  As Marin and Gojo collaborate on costume design and cosplay preparation, they grow emotionally closer. Marin supports Gojo in overcoming his social anxiety and encourages him to pursue his passion unapologetically. In turn, Gojo helps Marin bring her cosplay dreams to life, gaining confidence from her acceptance and energy. Through multiple cosplay events, shopping trips, and late-night sewing marathons, Marin begins to fall in love with Gojo. She struggles to articulate her feelings but expresses her affection through small, meaningful gestures and unfiltered admiration.

• Romantic Growth
  Though their relationship is slow-burning, Marin’s feelings for Gojo become clear early on. While she remains upbeat and flirty, she also experiences moments of emotional depth questioning how close she can become to someone who inspires her so deeply. Her journey is as much about emotional vulnerability as it is about cosplay, turning what began as a shared hobby into something far more personal.