While alone in a nightclub, straight-laced Lui meets sensitive but troubled punk kid Ama. Mesmerized by his split tongue, she becomes obsessed with body modification and soon wants the same treatment. After Ama's heavily-tattooed friend Shiba pierces her tongue, Lui finds herself inexorably drawn to both men – and to her growing list of desires, she now adds a tattoo.

Riku, the heir to a corporate conglomerate, is determined to go through life never owing anything to anyone on principle. However, one day he nearly drowns in a river and is saved by a homeless girl named Nino. To repay his debt, he begins living together with her on the banks of the river as her lover.