grandfather was killed by the Opast, Cadenza, while protecting him and Kuroto. Protecting Kuroto and defending the world against Duras are also contributing factors to his becoming a zweilt. Despite the fact that he is not Kuroto's original partner, their relationship has strengthened to an unbreakable bond over time. He even earned Oboro's, Kuroto's fallen partner's, zweilt ring from Kuroto. He has a love for calligraphy and is a college student studying art. He uses a large calligraphy brush to draw spells and a gigantic scythe called Death Scythe. Giou Clan Takashiro is first introduced as Yuki's older half-brother. When he meets Yuki for the first time, he tells him that he and his father had been looking for him ever since his birth fifteen years earlier. He is also the head of the Giou clan. As revealed later in the series, Takashiro performed a forbidden ritual that allowed him to take a Duras into his body. Because of this he, unlike the Zweilt Guardians, has not been reincarnated. Instead he has lived for over a thousand years, remembering everything, including how the war with Reiga first began. He also heals almost immediately after being injured. He believes that in order to win the war, there have to be sacrifices. He possesses a grimoire (the Book of Solomon) much like Kanata, although his is red. It has been told that Reiga was his friend. He is also the one responsible for continually causing Yuki and the Zweilts to reincarnate so they can continue fighting Reiga. He apologizes for lying to Yuki, telling him that he is not really Yuki's brother, but Yuki forgives him, telling him that despite that, Takashiro is still very important to him. In the manga, which the anime did not adapt from, he eventually becomes overcome by the powerful duras within him who is revealed to be none other a fraction of King Lucifer himself. The curator at Twilight Mansion and a member of the Giou clan. Tachibana has an upbeat personality and likes to keep conversation going. It is also mentioned in the manga that he may be a opast. Isuzu is the Giou's family doctor who works full time at the infirmary located at Twilight Mansion. Isuzu is known for passing out for various days from lack of sleep, which is caused by his sleepless and restless nights of researching the subject of Duras.