Tomiko Sonohara (園原 富子) is a target in Hiwata no Nadoko. In early stages of development, she was called Omoi Agaru (おもい あがる), the Japanese phrase meaning "to be conceited."
When Tomiko Sonohara transferred to Yamamura High School, she became quite popular, but was never quite as popular as Reika. Tomiko partnered with other girls in the school to spread rumors about Reika, ruining her reputation completely.
No story related to gameplay is known yet, as the demo has not been released.