Yashiro Isana's life was unremarkable in the technologically advanced Shizume City. He attended the esteemed Ashinaka High School on an island outside the metropolis, extending a friendly demeanor to his peers. However, he had the bad habit of misplacing his school-issued PDA. The routine existence Yashiro had known took a surreal turn when Tatara Totsuka, a prominent member of the infamous HOMRA, was killed. The perpetrator bore a striking resemblance to Yashiro, prompting the HOMRA's Red Clansmen to relentlessly pursue him, believing Yashiro to be the assassin. The consensus was unanimous: Yashiro was the killer.