Miura Miki

Miki is a student and fellow classmate of Hisao's in Class 3-3. She is an amputee, missing her left hand below her wrist, which is covered in bandages. She's is on the track team and is considered the second fastest in the school, behind only Emi.

Spoiler

Despite this, she is not mentioned, nor does she appear in Emi's route (outside of back ground shots). Rather she is mentioned once in Lilly's route, and interacts with Hisao for only a small portion of Hanako's route.