|Studio||Kiseki ▪ Miracle ▪ Studios|
|Network||Kiseki ▪ Miracle ▪ Network|
|Original Run||10th January 2017 - ???|
|Opening Song||Mizu no Hikari|
Fujikawa Kyōi is a shy, ordinary 13-year old girl who loves reading about mermaids. However, one day, she finds a small purple pearl on the beach and decides to wear it in a locket. The day after Kyōi found the pearl, she touched water and grew a tail! She then also met Shelly, a small water pixie who tells her that the evil sorceress, Prisma, is attacking the underwater world and Kyōi is one of the 10 to help defend the underwater world!
Fujikawa Kyōi (藤川驚異 Fujikawa kyōi?) / Violet (バイオレット Baioretto?) (Mermaid) / Amethyst (アメジスト Amejisuto?) (Idol)
The main protagonist of the series. Kyōi is very shy and loves reading books about mermaids. After she found the purple pearl, she can transform into a mermaid called Violet and an idol called Amethyst.
Akabana Hi (赤羽日 Akahana hi?) / Scarlett (スカーレット Sukāretto?) (Mermaid) / Garnet (ガーネット Gānetto?) (Idol)
Hi is a popular singer and musician who has just transferred to Umikaze Academy. After finding the red pearl, she can transform into a mermaid known as Scarlett and an idol known as Garnet.
- Rainbow Pearls (レインボーパールズ Reinbōpāruzu?)
The transformation item that allows the girls to transform into both mermaids and idols. To transform into mermaids, the girls just need to touch water.