Kosame Amagai is a fair-skinned teenage girl with shoulder-length silver hair and violet eyes, always wearing a white eyepatch over her left eye. Her standard outfit includes a pink long-sleeved sweater, a white and green sailor collar with a green bow, a yellow and white plaid skirt, and brown loafers, accented by a heart-shaped choker charm. Activating her magic transforms her hair tips to light indigo and projects emblem symbols in her eyes. Her demeanor is calm, soft-spoken, and friendly among close friends, though she shows little facial expression. Underlying this is severe mental turmoil: panic attacks triggered by loud voices spark self-harm urges, requiring regular medication and earning her the moniker "Mental Girl" from Rina Shioi. Meek and timid, she openly accepts her terminal fate while fearing assassination by Site Administrators. Kosame exhibits fierce loyalty to fellow magical girls, endangering herself to heal allies like Kiyoharu Suirenji and Asahi Takiguchi—even offering her remaining lifespan for their survival. Her bond with Kiyoharu is especially deep; she disclosed her illness to Kiyoharu before her family and relies on her for hospital visits. Removing her eyepatch unleashes a chuunibyou-influenced persona: nonsensical speech gives way to aggressive combat confidence. Diagnosed with terminal cancer and a six-month prognosis, her ensuing depression worsened after overhearing classmates discuss futures. This despair drew the Mahou Shoujo Site's attention. Administrator Hachi contacted her during class, sparking her friendship with Kiyoharu and granting her first wand, the Box Cutter. An alternate timeline (Chapter 136) saw her tumor vanish, averting her depression and magical-girl selection. Her primary magic, via the Box Cutter, heals physical wounds by cutting herself and feeding blood to injured people—though it cannot restore wand-depleted lifespans and risks fatal blood loss, as nearly happened healing Kiyoharu. Later wands from the Collection of Sticks include: a Shield reflecting attacks, a Sports Cap generating oxygen bubbles for hostile environments, and an Umbrella firing "Destroy Hell Flash" light blasts. All wand use shortens her lifespan, marked by fading emblem gauges on her body. Personal details: Born November 6 (Scorpio), she enjoys online gaming, sleeping, Twitter, plush animals, anime, online shopping, self-harm, sweets, and occult topics. She dislikes garbage and children—ironic given her two younger brothers. Her name kanji (雨谷小雨) means "rain valley" (Amagai) and "light rain" (Kosame). Her design incorporates "menhera" subculture aesthetics reflecting mental health themes. Shyness makes her avoid self-introductions, though she occasionally displays dramatic tendencies.