 Complete the following phrase:  On 31 March 1999, Morioka debuted for Japan national team against Brazil. After the debut, he became a regular player and played all matches including 1999 Copa America in 1999. He mainly played as central defender in three back as Masami Ihara successor. He also served as captain in many matches. In September 2000, he was elected Japan U-23 national team as over age for 2000 Summer Olympics. He played 3 games as captain. In October, he played at 2000 Asian Cup. He played full-time in all 6 matches and Japan won the champions. He also played at 