Hiroki Ishiyama

Hiroki is Yumi's younger brother and a sixth grader at Kadic. His best friend is named Johnny, who has a major crush on Yumi. Although Yumi is usualy anoyed by Hiroki, she still loves him, as shown on numerous occasions. In the episode "Lost at Sea", Hiroki steals Yumi's diary and Ulrich finds it. To help Hiroki apologize to his sister, Ulrich secretly returns the diary, but Yumi thinks it was Hiroki and forgives him. Hiroki also has a huge crush on Milly.



Yumi with Hiroki to her right and Johnny to her left.