Mizuumi Ramune

 (水海らむね) is a former founding member of no concept, Oka no Kiseki, and Niconico♡PRINCESS, and a former member of Niconico♡STREET.

She was a founding member of Oka no Kiseki and graduated in April 2020.

Simultaneously, she joined Niconico♡STREET in July 2018 and graduated in September 2018.

She was a founding member of no concept.

She graduated from Niconico♡PRINCESS on May 28, 2023.