Dia Lady was announced in February 2013 at a special event for the SATOYAMA Movement. The group name comes from diamonds, one of the hardest and most valuable stones in nature, and the fact that it is the birthstone of both members. The unit was described as a one and only, top class diva duo. It was formed alongside the groups Mellowquad and HI-FIN to be part of the "Hello! Project SATOUMI Movement", a movement with the aim to remind Japan of their beautiful oceans and beaches, and the need to keep them clean and healthy, similar to the "Hello! Project SATOYAMA Movement" that puts focus on the countryside.
- [2013.08.07] Lady Mermaid / Eiya-sa! Brother / Kaigan Seisou Danshi (レディーマーメイド / エイヤサ!ブラザー / 海岸清掃男子) (Dia Lady, Mellowquad, HI-FIN)
Compilations / Other
- [2013.12.11] Hello! Project - Petit Best 14 (#15 Lady Mermaid)