3-gatsu no Hekireki

Yori is a first-year high school student who has a permanent disability in one of her legs due to a traffic accident. She ends up having to repeat a grade as she had to take a break for medical treatment and those around her now keep their distance from her. That is until she reunites with Yayoi for the first time in 10 years, a childhood friend a year younger that she doted on like a younger brother. However, Yayoi, whom she has not seen for a long time, seems to have an unusual obsession with Yori, like being extremely jealous of her oshis or telling her to marry him when they first met. (Source: MangaDex)