Mayaka Niji ni Naritai Lyrics belongs to the anime 801 TTS Airbats, take a look at the argument:
Koshiyama Shiki, a first-year student, was invited to his senpai's mysterious Quiz Study Group as soon as he started high school. What will Shiki discover when dragged into the dazzling world of competitive quizzes by his classmate Mari?! (Image courtesy of Comic Walker)
If you still want to learn more from the anime of the song Niji ni Naritai, don't miss this information about 801 TTS Airbats:
801 T.T.S. Airbats, also known as Aozora Shjotai (lit. "The Blue Sky Girls Squad") in Japan, is a manga by Shimizu Toshimitsu that was adapted into a seven-episode anime series by Studio Fantasia and Victor Entertainment. Between 1994 and 1996, the series was released in Japan on LaserDisc as a series of OVA episodes, and ADV Films licensed the series for English language distribution. Since 2005, the book has been out of print. On April 9, 1996, the series premiered on TVB in Hong Kong.