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Rui & Rei Kagene (影音ルイ/レイ Kagene Rui/Rei) are Shadow versions of the twins, with their family name composing of the Kanji Kage (影 kage lit. Shadow). Both have black hair, white shoes with pale yellow trim, and elf-ear-like earphones. Rui looks very ladylike with her gray skirt. She also has the black vest, with a ragged white undershirt, and black tights. However, she does have a flaw: her impulsive yandereness. This comes from her overprotective streak for her brother. Rui and Rei is conceptualized by Hanepochi, the same person who created Kizaito.