Naoki has grown tired of his dull, uneventful days that simply slip by. One day, his sense of emptiness deepens even further when his fiancee breaks off their engagement, telling him he's "boring." Soon after, by chance, Naoki wanders into a tattoo studio, where he meets Aisuke, a tattoo artist. Drawn irresistibly to Aisuke's mysterious charm and to the "traces of past love" etched into his chest, Naoki finds himself falling deeper and deeper...