One day, a sudden kiss ignites a thirst that had been suppressed. Akari, a girl who always stays in the nurse's office away from the classroom, has a scar engraved on her slender arm. Kanna, a married teacher, has a bruise hidden beneath the long sleeves she always wears. As they lick each other's wounds, even the pain in their hearts begins to erode. A warmth that cannot be called love, an obsession that cannot be called healing. Lips and fingertips meet as if embracing each other. Akari's feelings shake Kanna, and...