Rizu Ogata

Rizu is a math and science genius since young, known as the "clockwork Thumbelina". She is a very serious girl, always trying to understand human behaviors, especially love issues, by scientific methods.
She is determined and very stubborn, which makes her oblivious to her surroundings once she's focused on something.

From the time she was young, she was never satisfied with a vague answer, which made her think that humans emotion are incomprehensible as compared to mathematics or science.

Rizu tends to have problems in interpersonal relationships, having difficulties in expressing appreciation to close friends such as Sawako Sekijou. Although she is seen to always have a poker face on, she is capable of showing emotions whenever she's happy or down.