Shin Kibayashi also known as Seimaru Amagi, is a Japanese manga storywriter, novelist and screenwriter. Under the name Yuma Ando, he received the 2003 Kodansha Manga Award for shōnen for writing Kunimitsu no Matsuri. The penname "Tadashi Agi" (亜樹 直) is shared with his sister. He graduated from Tokyo Metropolitan Musashi Senior High School and Waseda University School of Economics & Political Science.

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