High school student Miko Yotsuya's world is shaken when she begins seeing terrifying monsters. Despite her fear, Miko bravely continues her routine, ignoring the horrors around her to protect herself and her friend Hana Yurikawa. In the eerie yet comedic tale of Mieruko-chan, Miko confronts the supernatural by feigning nonchalance, facing her deepest fears head-on.