The main character "Nick" is able to transform into "Captain Rainbow" a tokusatsu-styled superhero wielding a yo-yo, with a wish to restore his lost popularity. To restore his popularity, Nick ventures to Minmin Island; an island where wishes are said to come true, he'll meet a vast array of past minor Nintendo characters with their own dreams and wishes on his journey. The game features a stylized cartoon look similar to Skip's other games.
The gameplay of Captain Rainbow can be divided in two parts; the adventure part and the action part.
The adventure part of Captain Rainbow is set on enjoying the Island Life together with the other islanders. Nick can go fishing, bug catching and help the other Islanders with their requests. Most of the request can lead to various mini-games, such as boxing, volleyball, fishing and golf. Helping islanders can get you special crystals, shaped like little stars, known as: "Kirarin" (”Sparklies”).
The action part is based around those crystals. Each time, if 20 Kirarin are collected, a star will fall from the sky. The star can be carried to an altar at the top of the Island where it will grant a wish. While carrying the star to the altar Nick is challenged by a mysterious Shadow who for unknown reasons wants the star for himself. If Nick succeeds in bringing the star to the altar there will be two choices left for him. He can either grant his own wish to become a popular hero again or grant the wish of one of the islanders and go back to finding other Kirarin.
Developed by Skip Ltd., Captain Rainbow is currently only available in Japan, with a European date yet to be determined.