Toujou Household
Basara Toujou[]
Rikka begins developing her crush on Basara after he assisted the student council during the sports festival. She experiences sexual pleasure for the first time from Basara right before Christmas break. During the third term, Rikka decides that she would use her power as student council president in order to pursue Basara. She has dreams of sexual encounters with Basara.
Nanao Tachibana[]
Rikka is shown to be close friends with Nanao as both are seen to be together most of the time in Hijirigasaka Academy.