Yoke and the leader of the angels, Sakaki. For the conclusion, she originally had planned to use a tragic ending, but decided against it in favor of a happy one, because she thought that it would be too upsetting for the fans to read after twenty volumes. When Angel Sanctuary was adapted into an audio drama series, Yuki participated in selecting voice actors; around two to three auditioned for each role. Ten, however, auditioned for the role of Setsuna, with Kenji Nojima ultimately chosen. Ayako Kawasumi provided the voice of Sara, while Takehito Koyasu and Yuuko Miyamura voiced Sakuya Kira and Kurai, respectively. For Arachne, Yuki envisioned a "transvestite" voice actor, which proved to be unfeasible. The antagonists Katan and Rosiel were voiced by Shin-ichiro Miki and Nozomu Sasaki, respectively. Yuki attended several sessions, during which she directed the voice actors and helped them with their interpretations of the characters. Yuki assisted on Angel Sanctuarys adaptation into an original video animation (OVA). She helped with the color direction on the first episode; although she prefers the color combinations of white, red, and black, the production staff was interested in including an abundance of color to the anime adaptation to prevent it from seeming "dull." She also produced character designs with detailed descriptions on various elements, such as eye shape and earrings. Editing the already finished script was the most difficult aspect of the adaptation for her, as time and space constraints resulted in the elimination of some scenes and she felt that sometimes a character's personality would be changed. She insisted on the inclusion of certain narrative points, which made it tricky to reach a compromise with the production staff at times. Regardless, she expressed her satisfaction with the finished product. Cultural references and influences In Angel Sanctuary, Yuki incorporated references to several mythologies and religions. Greek mythology features prominently, with allusions to the Orpheus' descent to the underworld, the mythical location Hades, Pandora's box, and Prometheus. Additionally, the transgender demon Arachne takes her name from the weaver Arachne. References to Norse mythology also appears, with allusions to Yggdrasil and the dragon Nidhogg. Other mythologies alluded to include Jewish and Christian mythology; Yuki used quotes from the Bible periodically in the series. Additionally, Yuki included references to real-life people, literature, locations, and music. The Tower of Etenamenki is an allusion to the ziggurat Etemenanki in Babylon. The character Katan shares