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A murder takes place. In order to prove his innocence, prime suspect Ryota imprisons Akane in his room. Akane, who suspects Ryota committed the murder, happened to be at the murder scene. Ryota begins to think out what happened, but becomes nervous that he won't be able to prove his innocence. Akane then offers to help Ryota. Using a computer and smartphone they work together to prove his innocence.