Note that there is no all ages version and Steam and Denpasoft both have identical uncut, demosaiced releases. That means you'll need the right config toggles in Steam before they'll let you see it exists. Pick it up with a 10% launch discount on either store:
Steam: https://store.steampowered.com/app/1100800/I_Walk_Among_Zombies_Vol_2/
Denpasoft: https://denpasoft.com/collections/newest-releases/products/i-walk-among-zombies-vol-2
The new heroine in this one is really cool, and as with volume 1, the volume 2 is one part post-apocalyptic survival horror one part human drama. This time, I'd say, with a little more emphasis on the "human" angle, as Yuusuke slowly starts to become a little less of a clod.