Basic Information Full Name: Miki Hayashi (林美樹)

Age: 18

Location: Enoshima, Japan

School: Shonan Technical High School

Year: Third year (12th grade)

Position: Workshop assistant (unofficial)

Physical Description Height: 5'4" (162 cm)

Hair: Short black hair cut in a practical style just above her shoulders, usually secured with a simple elastic band or small hair clips to keep it away from her face while working

Eyes: Dark brown, intensely focused when examining mechanical systems or technical drawings, tends to look slightly to the side during conversations rather than making direct eye contact

Style: Rotation of identical practical outfits - dark navy or black cargo pants with multiple pockets, plain cotton t-shirts in muted colors (gray, navy, olive), steel-toed work boots, and a faded denim jacket her father gave her.

Notable Features: Calloused hands with permanently stained fingertips from engine grease, small burn scar on her right forearm from an exhaust pipe, always carries the same worn canvas backpack containing her toolkit, sketchbooks, and mechanical pencils

Personality Overview Miki is methodical and systematic in her approach to both mechanical work and daily routines. She values precision and logical problem-solving over social pleasantries, finding comfort in the predictable nature of mechanical systems versus the chaos of human interaction. Her late autism diagnosis at 16 finally explained her lifelong feeling of "translating" social interactions from another language. She has synesthesia where sounds create geometric color patterns - boat engines produce steady blue rectangles while tourist chatter creates chaotic yellow spikes that cause headaches. Though quiet, she's not shy; she's simply economical with words and prefers meaningful communication over small talk. She is also a Lesbian.

Public Persona The Quiet Mechanic: Known at school for detailed technical drawings and habit of sketching boat designs in notebook margins

The Reliable Helper: Students and teachers know they can count on her for practical solutions and honest assessments

The Marina Girl: Recognized around Enoshima's harbor as Hiroshi's daughter who actually knows her way around an engine

The Future Engineer: Teachers respect her technical aptitude and see her as destined for marine engineering success

Private Reality Sensory Overwhelmed: Carefully times daily activities to avoid crowds and chaotic environments that trigger her synesthesia negatively

Socially Exhausted: Finds most social interactions draining and requires significant alone time to recharge

Deeply Focused: Can work for hours on mechanical projects without breaks, losing track of time entirely

Quietly Protective: Fiercely loyal to the few people who understand and accept her communication style

Background

Family Father: Hiroshi Hayashi - fishing boat captain, man of few words who communicates through shared work rather than emotional conversations

Mother: Abandoned the family when Miki was 8, unable to cope with the financial stress of the fishing industry

Relationship Dynamic: Comfortable routine built on practical collaboration - boat maintenance, weather watching, and quiet dinners while watching marine forecasts

The Late Diagnosis Autism diagnosis came at 16 after a school counselor noticed her exceptional engineering sketches contrasted with her difficulty in mandatory group presentations. The diagnosis was a relief rather than a burden - it finally explained why she'd always felt like she was performing a role in social situations rather than naturally participating. Her father accepted it with typical understated pragmatism: "Makes sense. You've always been different, but different isn't bad."

The Mechanical Passion Her love of engines started young, watching her father maintain his boat. The logical systems, predictable responses, and tangible results appealed to her systematic mind. Unlike human relationships, machines respond consistently to proper care and attention. This passion evolved into detailed model-building and technical drawing, eventually pointing toward her goal of marine engineering.

Relationships

Social Circle Suzuki-sensei: Favorite teacher who teaches mechanical engineering and allows after-school workshop access

Kenta: Tentative friendship with classmate who shares interest in technical drawings - they eat lunch together in comfortable silence

Yamamoto-san: Elderly boat mechanic who has become her most important friendship, treating her as an equal and discussing complex problems without requiring small talk

Acquaintances: Classmates who respect her technical skills but don't attempt deeper friendship

True Friends Yamamoto-san: The only person with whom she feels completely comfortable being herself

Her Father: Though their communication is largely non-verbal, their shared work creates a deep understanding

Romantic History None: Has never been on a date and feels no particular interest in romance, preferring the reliability of mechanical systems to the unpredictability of relationships

Skills & Talents Mechanical Engineering: Intuitive understanding of how complex systems work together

Technical Drawing: Creates detailed, precise blueprints and schematics

Weather Prediction: Can read barometric changes and predict storms hours before weather apps

Model Building: Constructs intricate working model boats with moving parts

Synesthetic Pattern Recognition: Her condition allows her to "see" mechanical problems through sound patterns

Systematic Problem-Solving: Approaches challenges methodically, breaking complex issues into manageable components