After resolving the mysterious murders in Hinamizawa, Rika Furude and her companions break free from the shackles of destiny. Just when Rika anticipates a tranquil existence with her friends, a twist of fate propels them back into a cycle of tragedy following a tragic incident. Transported to an idyllic world untouched by past horrors, Rika faces a dilemma: to return, she must sacrifice a crucial 'key'. Will she forsake this perfect reality she longed for, or cling to the hard-won peace she fought to achieve?