Sasaki Haru is a student at Kataoka High, who is the same age as Suzuran's Tetsuwan Tsutomu and Housen's Tsukimoto Mitsunori. He joined The Front of Armament in his freshman year and is the junior of the seventh generation Head, Murata Shougo. Haru served as the Guardian of the Armament's Seventh Generation.

After Todokin's recruitment into the Armament, Haru took it upon himself to act as a mentor to him.

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