Former KAT-TUN member, Koki Tanaka has returned and is now debuting as the lead singer of rock band, INKT. After leaving the group in 2013 due to his company terminating his contract, not much was heard but now, we know that he is the lead singer of the band, INKT.  Joining him are members Kei (Guitar), Kissy (Keyboard), mACKAz (Bass)…