Knows Rei from when he was little and is a relative of him. Rei promised to marry her when they were younger. She has a great affection for Rei and doesn't listen to anyone else. She is good with animals, likes dark places and prefers being alone. She also likes humans, is sincere and shy. In chapter 154 she wants Rei to give Yuuki,Toki,Rui,Sakura and Heike four-leaved clovers because they, as she said, cared about her.
She can use some of the Seven Flames too,like Satan Blaze and Belphegor, as she is,like Rei,of the Lineage of the Hell Emperor. The Code:Names used her because of that,especially Kagerou as he sometimes posessed her body to use it for murder,which made her afraid of being close with people and prefer being alone because she didn't want to hurt anyone.
After Mishiru refused to kill Rei when Kagerou posessed her body again in chapter 155, Saechika promised her that he wouldn't kill Rei,Sakura,Yuuki,Rui and Toki if she'd come with him, because, as he said, she isn't just a normal person with special power because she came of the Lineage of the Hell Emperor. Mishiru then walked to him but Rei stopped her,saying he wouldn't let her go.Mishiru then told him she's just a tool for murder and that to die as a tool for murder was her decision. Sakura,when seeing Mishiru's cold and stubborn eyes,then sacrificed herself. Mishiru stayed with them after that.
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