Pure Night: Futanari Infection

A city sealed off for fifteen years turns out to have gotten a lot worse in isolation, and you're the one walking back in to find out how. What's waiting inside isn't zombies in the usual sense but something stranger and hungrier: futanari zombies, futanari aliens, and giantess-scale threats that don't just kill you, they digest you.

The setup is straightforward survival-horror plotting. The city's original incident is never explained upfront, so uncovering what happened, and what it turned the population into, becomes the actual reason to keep moving forward instead of running for the exit.

Play runs on turn-based combat against the infected and the transformed, with the constant risk of corruption or infection working against you as much as any enemy's attack stats. Losing isn't always a clean game-over either, given the giantess encounters built specifically around being swallowed and broken down rather than just outright killed.