Also known as: クリムゾンカオス; Crimson Chaos; Crimson Crown
From Bliss : In this universe, there are four worlds: Meikai, the center of the universe, Ninkai, the human world, Youkai, where monsters with shape-shifting forms live, and Shintenkai, the world of the Celestials. Shiba Yukinari is one of the few who are born of both Youkai and Celestial blood - during the day, he works as a detective, but also has the job of exterminating youkai. As he works collecting 'cores', or a youkai's source of power, he meets Riifei who that demands that Yukinari hand over his own 'core'... Vol.1 Crimson Vol.2 Crimson Crown Vol.3 Crimson Chaos
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