In Oreimo 2 Episode 15, Meruru sings a song with the line "Red, blue and yellow, magic of many colors". I can't find the title of the song. It sounds amazing! Does anyone know it?
That song seems to be called "Planet ☆ Burst", "Planet ☆ Bust", or "Planet ☆ Buster". Here's the screenshot from the ending credits where I got that name.
The hiragana say "Puranetto ☆ Baasuto". It's not clear to me exactly what the second word is supposed to be. My first thought was either "burst" or "bust", but I found a Reddit thread that refers to the song as "Planet ☆ Buster". This is also the name given on the Youtube video of the song linked by the Reddit thread. However, I would have expected "Planet ☆ Buster" to be written "Puranetto ☆ Basutaa" in hiragana.
Kanako is singing this song in Episode 15 when Kyousuke enters the concert hall, just before she confesses her love to him.