Living in solitude within a dense forest, a solitary monster shuns human contact due to her frightening appearance. However, her world shifts when she encounters a blind girl named Lily Blind wandering near her desolate abode. Ignorant of the monster's visage, Lily treats her with unprecedented kindness, sparking a desire for connection within the monster, affectionately dubbed 'Heath' by Lily. To bridge their worlds, Heath fabricates a false persona, leading to a cascade of misunderstandings that weigh heavily on her conscience. Fearing Lily's imminent departure, Heath grapples with the need to confess her true feelings before losing her chance. 'Bocchi Kaibutsu to Moumoku Shoujo' delves into the blossoming and complex romance between these two misunderstood girls.