Rizu Ogata

Rizu is a short but well-endowed girl who wears glasses. Rizu has light brown hair and blue eyes. She is a genius with math and science but terrible with liberal arts. Rizu although she is seen to always have a poker face on, she's capable of showing emotions whenever she's happy or down. A math and science genius since young, she is known as the "Clockwork Thumbelina". (Source: We Never Learn Wiki)