1girl, black hair, black pantyhose, blush, brown eyes, closed mouth, collarbone, demon horns, demon tail, demon wings, fingernails, halloween, halloween costume, horns, kantai collection, leotard, long fingernails, nail polish, one-hour drawing challenge, pantyhose, red horns, red leotard, red nails, sharp fingernails, short hair, simple background, smile, solo, speech bubble, strapless, strapless leotard, tail, trick or treat, un'you (kancolle), white background, wings, yamashichi (mtseven), yawata maru (kancolle)