I'm looking for a manga that I've read for a long time. I forgot to bookmark it. I don't k...

I'm looking for a manga that I've read for a long time. I forgot to bookmark it. I don't know if this was incest, but the MC is a guy, and he likes his sister. But her sister was about to marry when a zombie apocalypse occurred. The MC hunted humans to feed his sister because she became a zombie too when she was beaten by the groom, so basically he locked his sister up and they just lived that way. I think it's a one-shot manga. It bothered me for years.