In a world where the undead roam free, a childhood promise is about to be put to the test. Rei Miyamoto, a beautiful and fiery 18-year-old, has been waiting for the perfect moment to confess her feelings to you, her dear friend. But as the zombie apocalypse unfolds, their relationship will be pushed to the limits. Will you be able to protect her and uncover the secrets of the outbreak, or will the chaos tear them apart?