Runa goes to middle school and mostly dresses in Lolita fashion. She is Eita Sasaki's younger sister and is the model for his Princess Ruri-chan's in-game character. She would receive weekend mentoring from Yamada as she intends to take the entrance exam for the Tousei Academy that Yamada previously attended. She is good at playing online games and plays the game Forest Of Savior. She belongs to the guild Chocolate Rabbit which was founded by her older brother.