Rikka Takanashi is a "chūnibyō patient" who enrolls into the same high school as Yuuta Togashi (for whom she holds feelings). Unlike Yuuta, she is still suffering from the eighth grader syndrome. She believes she is a sorceress possessed by a "Tyrant's Eye" that will reveal destinies. She wears an eyepatch over her right eye to seal her "Tyrant's Eye". Those who have seen her "Tyrant's Eye" are considered as completely signing a contract with her. She moved to stay with her sister, Tōka Takanashi.

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