Titled "Schoolgirl Trial," Yui became the youngest-ever recipient of a mystery literature award for her novel. Around her, close friends begin dying one after another under suspicious circumstances, mirroring the plot of her own story in a series of consecutive incidents. Amidst this turmoil, Yui is forced to confront profound questions about her own life. How could a schoolgirl so devoted to literature—her innocent heart and pure body—become entangled in such events? The mystery deepens steadily.