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Kugayohito is a vampire hunter who belongs to the Hellsing Foundation. His targets are vampires who hide in the darkness and prey on people one after another. Its identity was a virus. Those who gained tremendous power from being infected with the virus continued to increase their casualties as they desired. The caller goes to battle with his partner Hyuga to eradicate the vampires, but he has a great "secret" because he has the ability to surpass ordinary people.
For some reason, there are many incidents around Kirigamine Ryo, the deputy director of the detective department at Koigakubo Gakuen High School. The thief who disappeared from the school building, the relationship between the classmate and the poisoned coffee clan, the UFO turmoil of out-of-school learning-Ryo is enthusiastic about solving it, but the gag is just clear and the reasoning is developing. Is it the deputy director of the detective department who will show off the good reasoning? What is the end of the humor school reasoning?