Runa is a middle high school student who usually dresses in Lolita Fashion. She is the younger sister of Eita Sasaki. She is also being mentored by Yamada during the weekends. She is also a player of the game Forest Of Savior (FOS) and a member of the guild [Chocolate Rabbit].

Spoiler

Her brother (Eita) said that she is the model for his' character Princess Ruri

Spoiler

In Chapter 44, she showed one of her characters which is named I Love Meat. The character is a male elf, and her character's role is an archer.