Zom 100 Bucket List of the Dead Vol 13

After Shizuka is bitten by a zombie, Akira and the gang place their faith in Tsurumi. To save her, the vaccine researcher will have to gamble on their trump card, Izuna, the girl immune to the infection. Later, a military-grade helicopter appears over the pharmaceutical plant that the gang is using as a vaccine lab and a special forces unit descends upon the building. What frightening secret could they be after?