Eruka returns from Europe with Nokana shortly after User takes over the class, and it is obvious at first glance that she has fallen in love with Paris. She convinces User to help her with her project of finding love for everyone including him. However, it becomes apparent rather quickly that she has fallen in love with him herself, but does not have the courage to make the first move until User appears in her dream. From that point on, they develop a romantic relationship, and after they both meet Zena in a somewhat suggestive situation, she nudges her towards the more erotic side of their relationship as well.
User considers Eruka a hipster because of her specific style of dressing. Eruka is generally very positive and outgoing. She addresses User as "Monsieur" and often uses French words and phrases, although she doesn't speak much French and repeatedly asks User to teach her the language. However, when she learns of her grandmother's critical health condition, she reveals to User that she is afraid that she will accidentally hurt the people around her and therefore does not want them to take too much interest in her.
Eruka reportedly spends two to four hours every day refreshing herself.
Eruka's been childhood friends with Kio and Oki, and although they fall out over her inviting them to a college party in Okakri, which she herself didn't attend in the end, they quickly reconcile.
Eruka once tried meditating with Janu and Oki, but failed to get into her own plane of existence. Since then, however, she remains interested in meditation and often asks Oki for advice.
Eruka dyed blue hair and glasses on her head are supposed to remind her of Paris. She changed her appearance an hour before the flight back to Japan. Originally, she has chestnut brown hair.
Eruka is an unwanted child, her mother having missed the abortion date. She was raised by her grandparents. Her parents travel the world on their own and make YouTube videos and have no interest in their daughter.
Eruka grandfather died in a fire that started after he smoked near an oven that Eruka forgot to turn off. He saved Eruka before his wife, who survived with multiple scars.
Eruka favorite animal is a capybara.