The manhwa starts off 4 days into a zombie apocalypse and is ... and highly curious girl, Ruby, who tends to get herself in a lot of trouble because of her unending need to explore.

A zombie apocalypse breaks out, and high schooler Yuuma Kousaka gets bit pretty quick. As he's lamenting his imminent demise, he runs into his childhood crush, Haruka Hyuuga. Thinking he's about ...