Urara Kasuga

She is in love with her dear "Tonma-chan" and when she finds out that he is lying to Mieko in order to impress her, only respect and love for him prevents her from revealing Touma's secret. She keeps saying that her father is never around and is away on business when Touma keeps asking about where he is, but as he finds out later, they might be really having the apartment all to themselves.