Kokkoku follows Juri Yukawa, who has already failed 19 job interviews in a single day and is running out of hope for a life beyond her parents' home. She lives with her working mother Nobuko, NEET brother Tsubasa, laid-off father Takafumi, and single-parent sister Sanae, while the family’s best hope for raising a decent adult is Juri’s little nephew Makoto. That fragile routine shatters when Makoto and Tsubasa are violently kidnapped by a mysterious organization and held for ransom. With only 30 minutes to deliver five million yen to the criminals, Juri’s grandfather reveals a dangerously powerful secret to her and Takafumi.
By offering blood to her grandfather’s mystical stone, the three are drawn into Stasis, a hidden version of the world where time stops for everyone but the users. Once they reach their destination, the rescue effort collapses as they are attacked by a surprising group of people who can move around within Stasis. As the chaos escalates, a monstrous giant known as the Herald appears, and its intent and motivations remain as cryptic as the nature of this timeless world.