Satoshi Ito

The two main characters, Katsumi and Isami Minato, are brothers who live with their younger sister and father who runs a specialty store. One day, they found the R/B Gyro and R/B Crystals, which transforms Katsumi into Ultraman Rosso and Isami into Ultraman Blu.

Nobita and Doraemon enter the world in a European Renaissance painting, but run into trouble as they hop from piece to piece in search of a malevolent time traveler who wishes to recreate the extinct pigment of "Artoria Blue".