Sara&#039;s shy classmate and best friend. She has a crush on Setsuna, though Setsuna considers her old-fashioned (due to her thick glasses). 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. Her latent psychic ability helps reawaken Rosiel through the video game called Angel Sanctuary, and she is absorbed by him. He uses her physical appearance to attack both Setsuna and Sara. In the end, she lets go of her hatred for Sara and saves her life; now at peace, her soul departs.

Why is Setsuna so mixed up? Despite his attempts to be noble, he'll fight anyone anytime; he ignores all authority; and he harbors feelings for his sister that can only be described as "incestuous." Why is he such a mess? The reason may be found with two demons from the underworld and their enemy, an insane angel who is distributing an insidious computer game called Angel Santuary.
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(Source: Viz Media)

Mudou Setsuna, a high school student, loves his sister in a way that he shouldn't. He also struggles from supernatural powers. Angels and demons flocks to him as the day of his awakening draws near &mdash;he is the angel Alexiel, the highest angel which fought against God, reborn. 

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Ruri Saiki