After an incident five years ago, Tsukishima left behind Japan to go to Austria to study, only keeping in contact with a select few people. When Kageyama passes away in a car accident, Tsukishima didn't hesitate to come back, but Japan was filled with people and problems he'd tried so desperately to escape. People and problems such as Kuroo Tetsurou, the man who's name (whose soulmate mark) he'd burned off his skin.