相武 瑠璃羽

Likes: Whipped cream
Dislikes: Mushrooms

Seiji's (in reality, Sena's) rival and classmate. She is an ojousama due to her father owning his own business called Aibu Corporation. Ruriha is only next to Sena in grades, and plans to overtake her sometime, becoming the number one of the school. She is also Akino's roommate, and is often lecturing her about how she only talks about "mushrooms" so openly.