Heavenly Delusion, Volume 7: Tengoku Daimakyo (manga)

Disease and a new race of supernatural beings have nearly wiped out mankind, and two survivors are on the hunt for an oasis called Heaven.

After Kiruko met with her old idol, she and Maru embark on what should be a long road trip south. Meanwhile in the Academy, chaos has engulfed the campus and some of the children are now out on their own!