Misunderstandings are a common occurrence in human nature, and this rings true for Yokoyama. Despite being a diligent middle-schooler who attends to his duties in the infirmary, a few kind words from his classmate Nishino trigger his wild imagination, leading him to misconstrue her intentions and believe that she holds a romantic interest in him. Thus, Yokoyama sets off on a deluded escapade of fanciful daydreams with the deceitful Nishino.