Ever since an injury to his leg (a snapped tendon) that prevented him from practicing karate, which he had excelled in since elementary school, he has always believed that he was an ordinary, regular guy.

However, due to a promise exchanged with a beautiful Vampire (Most Ancient Sorcerer) Saitohimea nine years ago which he has forgotten about, he is in fact no longer ordinary.

Shortly after his change, a boy named Kurenai Hinata attacked them with a demon and killed Taito six times in rapid succession.

The episode consist of three short stories, two based on ideas tweeted in by fans, and one as a crossover with another of Kagami's work, The Legend of the Legendary Heroes.

[3][4] The manga adaptation, illustrated by Shiori Asahina, was published in Monthly Dragon Age from October 9, 2009 to July 9, 2012 and collected into six volumes.