Yuuta Togashi - Rikka goes to the same school as Yuuta. Throughout the series they make the "contract of lovers".
Sanae Dekomori - Rikka is Sanae's Master and best friend. They met on the internet two years prior to the start of the story. They have a very close relationship and share their interest in chuunibyou behaviour, often acting battles with eachother and casting "magic spells". Sanae looks up to Rikka and cares for her a lot, becoming upset when she threw away her true desires and agreeing to be forced to move with her grandparents. She became just a little jealous when Rikka began dating Yuuta, but eventually got over it and gave them her support.