Yousuke Otoha is a character dark in history and actions, breaking the traditional mold of a Japanese hero. He is portrayed as the product of incest between his mother and his brother who is the local yakuza boss. Otoha's back-story states him as suffering from congenital insensitivity to pain which lends the character a merciless reputation as his brother's enforcer.
Otoha runs a hospital for youkai, the mythical monsters unseen by the human inhabitants of Japan. The number of youkai needing medical assistance has grown, both because of attacks by the Mikura, and some intangible evil corrupting them from within. In response, Otoha has accepted the role of protector of Tokyo, the role of Karas, to to defend its inhabitants and the youkai from Ekou and his Mikura. With his eye-device (for lack of a better term at the moment), Otoha can transform into different forms. He can take on the form of "Hishokaku" to fly, or a ninja-like form to fight. As Karas, Otoha is the last bastion of defence against Ekou. He must fight not only Ekouo and the Mikura, but the course of destiny itself.
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