Anyone know this manga?

I read it a long time ago and can't find it again. All I can remember about it is that it's about a younger girl liking her much older neighbor who was really sad and withdrawn. Also, he was a dietician but didn't eat well himself due to depression. The two fall in love over time. The girl eventually reveals that she has memories that belonged to her neighbor's girlfriend who had died when they were teens (hence his depression). I think she remembered like how his brother got a scar on his hand or something which helped convince them that she had those memories. Gosh I hope someone can help; I searched all day and couldn't find it!