Yasunori Mitsuda
In 2005, Masato Kato also collaborated with Yasunori Mitsuda, longtime friend and music composer, to write a short story titled "Five Seasons of kiЯitɘ", which Mitsuda accompanied with music on his album "kiЯitɘ". The story and soundtrack have also been presented in opera form. Prior to this, Mitsuda composed the soundtrack for several of Kato's games, including "Chrono Cross" and "Xenogears".