Sara's shy classmate and best friend. She has a crush on Setsuna, though Setsuna considers her old-fashioned (due to her thick glasses). Ruri is chosen by Katan to be the last human sacrifice to free Rosiel. Setsuna, Sara, and Ruri are caught in the crossfire when Katan is attacked by Kurai; Setsuna chooses to protect Sara instead of Ruri, and it is the last thing she sees before she is blinded by shards of glass. Bitterly blaming Sara for her handicap, Ruri offers herself to Rosiel in exchange for killing Sara. When she helps reawaken Rosiel through the video game called Angel Sanctuary, He kills her and absorbs her body, taking her memories and form. He uses her physical appearance to capture Sara to use as bait for Setsuna. Later, Kirie uses what's left of Ruri's soul to try to kill Sara. Ruri manages to break free, and using the last of her strength, saves Sara from an attack from Kirie.