Have you ever wanted to feel so immersed while reading that you can picture each scene in your head with great detail if so I would recommend read Yuruginai kabe no monogatari for you.
I'm so into this story already.
I had a friend that was diagnosed with O.L.D and it wasn't easy, I remember how the girlfriend had to suffer because of it, so I understand. I'm ready to see how far Mr Black can go for her.