Yudai Tatsumi is a Japanese actor who is a member of the Johnny's Jr. unit Four-Yū. He is represented with Johnny & Associates. In 1998, Tatsumi entered Johnny & Associates when he was in elementary school 6th grade. In 1999, Tatsumi performed his stage debut as the young Koichi in the Koichi Domoto-starring stage Show Geki '99 Mask. He acted as a member of the Johnny's Jr. internal unit M.A.D. As a member of Four-Yū from April 2011, Tatsumi mainly works on the stage. Source: Wikipedia Watch drama online for free.