Ryuji, who didn't even know the faces of his parents, was picked up by a member of the Kinukawa-kai and naturally became involved in the underworld. When he went to collect a debt as usual, he found Shima, who had lost her parents, alone. Attracted by her aggressive attitude, he demands to meet him in exchange for repayment. Ryuji learns new feelings for the first time as he spends his days with Shima. And so the two of them begin to fall in love...