OVA
Description
Rika Tokino assists her family in operating the financially struggling Tokino Bathhouse as its younger sister and co-operator, sharing her parents' concerns about its viability. Her pragmatic and frugal nature leads her to prioritize monetary stability and academic ambitions for admission into a reputable high school and university over social activities. She once contemplated selling Valkyrie after a monetary offer, only to abandon the plan upon discovering the funds were counterfeit.

Within the bathhouse, she often provides a grounded counterbalance to eccentric alien encounters. Rika maintains a close friendship with neighbor Akina Nanamura, discussing personal matters like Akina's physical insecurities. Though occasionally annoyed by Valkyrie, Rika exhibits consistent tolerance and care, viewing her positively as a friend. She actively supports Valkyrie and Kazuto's romantic relationship, partly motivated by the potential financial relief of Kazuto marrying into Valhalla's royal family.

Her interactions with other Valhallan royalty vary: she shows concern for Princess Chorus despite bafflement at behaviors like unexpectedly residing in her closet; expresses irritation over Princess Laine's frequent spacecraft crashes near the bathhouse while retaining underlying care; and addresses Princess Mehm as "auntie" against Mehm's wishes, reflecting their connection through Mehm's advocacy for Valkyrie and Kazuto's union. Her relationship with the maid Sanada evolved from initial suspicion about motives to friendship despite Sanada's peculiar habits. Princess Hydra receives minimal direct engagement.

During third-season events, Rika continues managing bathhouse duties and pursuing academics amid new developments. These include Princesses Laine and Chorus establishing permanent Earth residences and the arrival of additional Valhallan princesses, each receiving episodic focus. Her established role as a stabilizing force persists through ongoing chaos, including efforts to formalize Valkyrie and Kazuto's marriage amidst complications.