Hanamori Iyori, a high school student troubled by a unique condition that allows her to read the "memories" of anything she puts in her mouth, harbors a secret crush on Ando—an older man who runs a neighborhood flower shop. But then one day, the middle-aged man is suddenly placed under emergency arrest as a suspect in a certain case. It turns out to be an unsolved serial murder spree that once sent shockwaves through society, commonly known as the "Salvia Case." Amidst the wailing police sirens and the clamor of the onlookers, Iyori summons her courage to take a giant step forward, uncovering a critical clue to the case!