Saotome Marimo

Yuzu's younger sister. She’s one of Hazuki’s friends at the kindergarten and a bit mischievous. She takes great pride in her older sister and will insist that she’s better than anyone else’s. Also enjoys getting on Riku and Rinne’s nerves by shouting at them and accusing them of various things, often resulting in them grinding their knuckles against her head as punishment and calling her names like acorn (due to her ponytail making her head look like one).