학교가기 싫음. 친구 없음. 혼자밥 먹음. 이런 나에게 무언가 생겨나기 시작했다. Not having any friends is bad enough, but being swallowed by mysterious black sludge in the middle of class? The worst. Yijun is no stranger to solitude, until a school project plants the seed for a delicate bond with another loner, Suni. But friendship is a frustrating puzzle for those who are used to being alone, especially when one of them claims to control a black goo that only turns hostile when the host is gripped by anxiety. Will Yijun and Suni be able to open up and make something of their budding friendship?