Koyomi Himeguri is the heroine of the *Yattodetaman* series, characterized by her bravery, determination, and appealing nature. Engaged to Wataru Toki, she faces a personal conflict when her feelings shift towards his secret identity. Her name, meaning "calendar" or "almanac," connects thematically to her character's conception. Initially intended to become Wataru's partner as Yattodetaman no. 2, this planned role remained unrealized within the series.