|Relatives||Jirokichi (adoptive father)|
|Alias||Spring Cherry Blossom|
|Anime Debut||Episode 1|
|Voice Actor||Eri Kitamura|
Koharu is Roman's younger sister. She runs a decorative chopstick shop by day and at night she assists with his brother's heroic capers. Her real name is Haru and she is in fact the last Princess from the Tokugawa clan who was left it Jirokichi's care.