Gaku Mikawajima (三河島學, Mikawajima Gaku) (or Gatcho, 學長) is a student at the Mikageyama Grade School and is a friend of Toshimori.     Source: http://kekkaishi.wikia.com/wiki/Gaku_Mikawajima

Yoshimori Sumimura is a 14-year-old student at Karasumori School. Following in the tradition that's come down through the generations, he is the twenty-second Kekkaishi of the Sumimura clan. But he’s constantly fighting with his rival, Tokine Yukimura—his childhood friend and also a Kekkaishi—about who is the rightful heir to the magical barrier arts. Protecting people from danger while growing stronger himself, Yoshimori will battle the forces of evil again tonight!<br><br>(Source: Crunchyroll)

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A Japanese actress, voice actress, and narrator. She received the Kazue Takahashi Award at the 5th Seiyu Awards.