The Drifting Classroom, Vol. 7 — Kazuo Umezu

A flash flood turns the desert into a drowned world, and the students struggle to protect the school--and their precious vegetable garden--from the deluge. But just as the first vegetables are ready to harvest, a strange fungus invades... Lonely for home and their parents, the students make a surrogate mother out of a statue, only to find it replaced one day by a new, terrifying idol...