The anime is set in Midi city, a place where those who command music control everything and where it's inhabitants called Mumons form bands to play music and compete with other bands to be on top.
A girl named Cyan ,who dreams of becoming a musician one day but is too shy to approach her school band, is brought from Japan to Midi City through her phone and turned into a white Gothic Lolita cat girl.
After scaring off a music devouring monster with her guitar skills and a magical guitar, she is scouted by Maple Arisugawa, the president of a music agency and invites her to the company. From there she meets ChuChu, a purple honor student rabbit girl, Retoree, a yellow net geek dog girl and Moa, a pink and black cosmic sheep girl. Together they all form a band called Plasmagica as they all tackle and perform together in the music scene while aiming to be the best music band of all Midi City while discovering the secrets surrounding the Legendary Instruments .
- Original Concept: Sanrio
- Director: Takahiro Ikezoe
- Series Composition: Touko Machida
- Character Design: Masaru Ohishi
- Supporting Character and Props Design: Ryou Hirata
- Sound Director: Masafumi Mima
- Sound Effects: Shizuo Kurahashi
- Head Animator: Tomokatsu Nagasaku
- Color Scheme: Fusako Nakao
- Art Design: Naomi Ogura
- Art Director: Hatsumi Kumano
- Director of Photography: Tsuyoshi Kanbayashi
- CG Design: Studio Goonies
- CG Director: Ryou Sasaki
- Editing: Kumiko Sakamoto
- Yasuharu Takanashi
- Rega Sound
- Music Production: Pony Canyon