In 1986, the Rook nearly kills Yuri when Jiro intervenes to finish their game, mocking the Rook with a new pair of sunglasses before Yuri is taken the hospital. In 2008, after the Warthog Fangire walks off after defeating Kiva, vowing to kill him once he becomes the King, Wataru is depressed that Mio is not answering his calls, due to Shizuka's meddling. Things get worse as his friendship with Kengo also gets strained when Wataru learned that Kengo could never play guitar again and hid the truth until Kengo left.