Amane is a curvy, attractive girl of slightly above average height with knee-length violet red hair that is tied in a teardrop by two white ribbons on either side and has dark blue eyes.
When not wearing the school uniform, she opts for bare minimum coverage in clothing in an effort to further accentuate her figure, most notably her large F-cup chest. Her casual outfit consists of a sleeveless blouse that exposes much of her upper body and black pants with a white belt and sandals. She is described as having a generally upbeat expression, having either a smile in general or a sultry grin with occasional interludes of almost loving concern, specifically for Makina Irisu.
During the events of Grisaia no Rakuen, she starts wearing a black asymmetrical-sleeved shirt and white shorts.
Six years before she met Yuuji Kazami (around 2005), Amane wore her hair in two braids hanging in front of her, as well as twintails coming out the sides of her head. She was much shorter at the time, had a less developed bust, and wore large-framed glasses.