Houko Hoshimiya is a character from the anime Clockwork Planet. She appears as a supporting character and is identified as an old school friend of Marie Bell Breguet, having attended the same academy as the young prodigy. Her background primarily establishes this connection to Marie, placing her within the same social and educational circles as one of the story's central engineers.

In terms of her role in the story, Houko is present alongside Naoto Miura and the others when they witness a major coup d'état. Her presence during this key political event ties her to the main plot as the group observes the escalating conflict between the Japanese government and the insurgent forces aboard the massive automaton known as the Yatsukahagi. She is part of the ensemble that faces the threat posed by the mastermind Gennai, who seizes control of the Yatsukahagi and uses its powerful main cannon.

No further reliable information is available regarding her personality, motivations, specific abilities, key relationships beyond her acquaintance with Marie, any character development, or her ultimate fate. Her precise background, including her family or any titles, is not documented.