I'm looking for a manga that I started a while ago but lost the link for and can't remember the name. It's about a guy who is immune to a disease that's killing his sister I think there parent are dead and at the end of the chapter the disease mutated his sister. The sister was in a hospital in quarantined behind a glass wall. I know it's an older manga and as much as I think I can remember the title does anyone have any idea of the name or anything.

It's Absorb; Ability.

thxs that's it