Office worker Goto Shizuka is suddenly stabbed by a street criminal that appears in the shopping district during the day, suffering life-threatening injuries. In that moment, what resonates in her mind is… 《You have been defeated by another. Countdown to disappearance has begun.》 Guided by the "Night's Guide (Guidance)," Goto manages to survive and awakens to abilities that ordinary people do not possess. From that moment, the world begins to connect with another realm, and monsters gradually start to appear…. Even amidst all this, Goto continues to strive to survive in a crumbling world, remaining carefree and bold!