Kouen No Himitsu No Game Asobi -

The rule was simple:

The truth: The park wasn’t abandoned. It was offered . Decades ago, a disaster killed several children during a festival game. Their spirits couldn’t leave. So the townspeople played along — sealing the park and creating the Secret Game as a way to feed memories to the lingering souls. Every player who forgets a piece of themselves strengthens the barrier. Every memory reclaimed keeps the spirits from fading completely. kouen no himitsu no game asobi

As a visual novel, the gameplay relies heavily on narrative choices and branching paths. However, Kouen no Himitsu no Game Asobi integrates its theme into its mechanics through: The rule was simple: The truth: The park