School-Live!, Vol. 3 — Norimitsu Kaihou

(Volume 2)
The adventures of Yuki, Kurumi, and Rii-san continue as they navigate their daily lives at school--of course, school's a little different now that civilization has apparently collapsed. When the girls find their food supply running low, Yuki suggests an excursion. But school trips are a little more complicated during the zombie apocalypse!