Once, they were an ordinary family you could find anywhere. Kind parents, and four brothers, each with different personalities and talents. The Kamisato household, always filled with laughter, was a happy home by anyone's standards. —Until that day, when their parents died in a traffic accident. Having lost its center, the Kamisato family gradually began to change. The eldest son, Saku, who chose justice. The second son, Rei, who chose to live outside the law. The third son, Chikage, a genius hacker who manipulates information. The youngest, Kanade, who heals people with music. Though the four were born into the same home and should have shared the same grief, the paths they chose were completely different. "Because we're family." Those words alone still connect them now. The crumbling Kamisato family is quietly falling apart, even today.