Plunderer Vol. 4 (manga)

Finally, the Waste War begins! As outside forces start to obliterate the school, the members of Class A-including Tokikaze and Jail-dive headfirst into an enemy-infested area to protect their friends. Meanwhile, an unconscious Rihito undergoes a risky operation far removed from the chaos outside. Will the blissfully unaware Ace-to-be make it in time to save his comrades?!