For the A. R. World version, see Sakuya Hishigata. Sakuya Tachibana (橘 朔也, Tachibana Sakuya) is a member of BOARD who transforms into Kamen Rider Garren (仮面ライダーギャレン, Kamen Raidā Gyaren, Masked Rider Garren). Tachibana was originally a researcher of the Humanity Foundation who graduated from the Sazahaibu University and was selected to be the user of Rider System 01 after Go Kiryu was found to be incompatible with the system. By the start of the series, Tachibana begins to suffer a form of cellul