Beautiful AVN. The characterization is some of the best I've seen. The plot has quite a few twists and turns that keeps the story engaging right to the very end. The animation and scene quality is decent to good.
Every main character feels fully realized, and experiencing their character arcs as you all grow to trust and depend on each other was a treat. The tension from the survival setting leads a certain authenticity to the relationships that many harem games struggle to achieve. Some of the harem game tropes were a little off-putting and goofy when standing next to some of the darker and more serious moments in the game, but the fusion of Walking Dead + Harem AVN works surprisingly well.
The actual story beats are pretty well executed, with a relatively keen eye towards believable conflict and resolution. The overall plot isn't too unpredictable, which isn't necessarily a bad thing. It has enough wrinkles along the way to keep the journey engaging, and the ending feels satisfying with a final epilogue send-off for all these characters that you've come to care about. That alone feels like a rare treat sometimes, since so many promising AVNs are in an unfinished state, or seem to have perpetual stories with no end in sight.
The game has a few hiccups here and there. The zombie presence becomes extremely minor near the end, except for a specific dark moment that was seemingly only there to remind us that it's a sad zombie story before going back to the plot. The final antagonists also felt kinda limp, with a lot of screen time dedicated to them only for their climax to be pretty straight forward with no real payoff for characterizing them so intentionally. There are other petty nit-picks, but none of these really affect my overall enjoyment.
Overall a stellar title that manages to balance the tight rope between a serious zombie survival story and a lewd harem game.