After Shen Jianxin returns to Daoxiang Village again, strange tales, unsolved cases, and outrageous inventions constantly appear... He and his partners embark on a new adventure.

The cute comedy manga and anime take children's stories and folktales from all around the world and asks, "what if a cat appeared in this story?"

The manga is about Koala who writes about daily life, whether it's good or bad, happy or sad, Koala treats every day as a precious day. Koala believes that today is a good day, and tomorrow will be a good day too.

Lee Sori, a polite and righteous girl, attends a middle school plagued with bullying. Enraged by the tragic effects it has had on her friend Kim Julie, she decides to take a stand against the bullying. Unfortunately, this only leads the bullies to switch their target to Sori. Believing a new environment would rid her of the hopeless situation, Sori returns to the city she used to live in and transfers schools. However, the traumatizing experiences that constantly haunt Sori's memory cause her to alienate herself from everyone else. Just as the grim reality of Sori's circumstances begin to set in, she discovers a mysterious letter taped under her desk. While the contents of the letter intrigue her, they only lead her to another letter. Now following a seemingly endless trail of messages, Sori is on a scavenger hunt to find the true purpose of these letters and the anonymous person behind it all.