The composer of many notable video games such as Chrono Trigger, Xenogears, Xenosaga Episode I:
Der Wille zur Macht, Chrono Cross, and others. He joined Square as a composer, but was working more as a sound engineer. Realizing this, Mitsuda sent Vice-President
Hironobu Sakaguchi a message to let him compose, or he would quit.
Sakaguchi let Mitsuda compose for one of Square's masterpieces, Chrono Trigger. Mitsuda worked so hard on that soundtrack alone that he was hospitalized due to a stomach ulcer. Well-known Final Fantasy composer Nobuo Uematsu had to keep an eye on Mitsuda due to this, and helped compose music for Chrono Trigger.