An elementary kid named Miruku is falling head over heels with a mysterious hero who recently appeared! After all, the warrior girl of justice, Ruby Red, single-handedly fights the evil Selfish Gourmand group who threatens public meals! Miruku can't help but root for her!

One day when it's time for school lunch, the evil Sushi Trio barge into the classroom aiming for the delicious Sushi Bowl. Everyone is forced to give the Sushi Bowl up, but just when they are resigning, Ruby Red arrives on the scene! Immediately, the Sushi Trio are repelled, just like that. Then, Ruby Red releases a shining light and transforms Miruku. Now, the bright cheery little warrior "Milky Pink" is gallantly born. With the reliable lass, Beniha Hoshikawa, and the wild lady, Umi Kurotani, together they become heroes and their fierce fight with the troublesome queen will unfold.