**Height:** 152 cm She is the younger sister of Kosaki Onodera that has just entered her first year of high school. On her way to school she was saved by a mysterious prince, who was actually Raku, and ends up with his locket. Her first impression of Raku was negative because she thought he was a womanizer trying to trick Kosaki and a pervert for unintentionally looking at her panties. When he asked her to return the locket she refused and told him to convince her that he was helping the prince. On another incident, Haru was helped by a mascot who was also Raku.

Spoiler

Gradually Haru warms up to Raku and realized that she had also fallen in love with him. But for her sister's sake she tried to put her own feelings aside to support Kosaki. In the end of the manga it is revealed that she took over the family business which has become famous due to her desserts.