A zombie panic breaks out in Tokyo, and a high school girl named Hino-chan, who is a part-timer, has to wait out till X-Day. Stuck in a convenience store and waiting to be rescued.... When all of a sudden, zombies have flooded the world.

Will Hino-chan be able to escape from the convenience store before the food and supplies run out!?

Note: This work was first published as a doujin on the author's Twitter account. A first volume covering days 1-7 was released on January 28, 2021.