Alternative title: Piano Forest The Perfect World of Kai The Piano Forest ピアノの森 (Japanese) 피아노의 숲 (Korean) Aya Ueto as Ichinose Kai Ryunosuke Kamiki as Shuuhei Amamiya Chizuru Ikewaki as Reiko Ichinose Hiroyuki Miyasako as Sousuke Ajino Mayuko Fukuda as Takako Maruyama Based on a manga by Makoto Isshiki Running Time : 1 hour and 41 minutes WARNING : The following contain spoilers.