Tadachika/Nagayasu Ookubo (大久保 忠隣 / 永易大久保) is a rare person who inherited two names and is a second year Representative Committee Chairman of Ariadust Academy.


She wears glasses and carries around two swords with her at all times.


She seems to be one of the rare 'normal' people aboard Mushashi as she comments on her upperclassmen and tries to find a common ground with any of them but fails with anyone she sees.

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