In Captain Rainbow players take control of Nick, a boy coming from 'The Land of the Free'. Nick's alter-ego is Captain Rainbow, a yo-yo wielding hero. In the past, Captain Rainbow was a major super hero in Mameruca until his popularity died down. Nick decided to embark on an adventure to Mimin Island, a place where wishes are said to be granted. The problem is though, everyone who has gone to Mimin Island has yet to have their wishes granted.