Umidori Tougetsu no "Detarame" na Jijou

Tougetsu Umidori is approached by a close classmate, Nara Yoshino, who sets off a chain of unusual occurrences. Shortly after, a mysterious girl wearing a cat hoodie named "BS" appears at Umidori's home. Her presence leads to a variety of odd situations, such as borrowing a toilet, experiencing betrayal, facing threats, and engaging in a struggle for freedom, culminating in a plea for mercy. After these events, BS asks Umidori, "Hey, will you kill the lies with me?" Despite uncertainty, Umidori agrees to join BS on her mission.