He started out in the game industry working for Universal Technos (now Aruze) in 1983 before leaving to join Tecmo. On April 7, 1986, Okada formed Atlus with six others, where he was the creative force behind the Megaten series along with Kazuma Kaneko. Cozy eventually departed from Atlus and formed the game company Gaia on October 31, 2003, which was known for games such as Monster Kingdom: Jewel Summoner until it was disestablished in 2010. Cozy's favorite demon the series is the mascot Jack Frost.