The infamous school journalist, Hiyono is the bubbly and energetic sidekick of Ayumu, always stuck to his side. Very clever
and a quick-thinker, her confidence borders dangerously on overconfidence. She is extroverted and is Ayumu's polar opposite,
serving as one of the series' few comic-relief characters. Her skill with computers are as amazing as her hacking abilities
and she has access to over one hundred resources. She blackmails Wataya often, and is very fond of Ayumu's cooking. Hiyono
is also one of the few who whole-heartedly believe in Ayumu; she also has a great deal of faith and loyalty in him that carries
on for the whole series. She attends Tsukiomi High School alongside with Ayumu Narumi.
At the end, it is revealed that Hiyono was also part of Kiyotaka's machinations. The reason she knew so much about
individual Blade Children, such as Kanone's foster parents' names, is because Kiyotaka told her. She is in fact older than
Ayumu (ironically the type of girl he likes), and being "Hiyono Yuizaki" was just an assignment. She was to be Kiyotaka's
final trump card—Kiyotaka would reveal her identity to knock away Ayumu's support.
After the final confrontation between Kiyotaka and his clone Ayumu, "Hiyono" left for her next assignment
in Germany, for two years. The manga ends with her visiting Ayumu in the hospital and hearing him play the piano with one
hand.
At the end of the anime however, the camera view shows a field of purple lilies and the viewers can hear Hiyono and
Ayumi exchange a few words. Apparently they are on a picnic and Hiyono has packed them lunch. Ayumu takes a bite of her food
but doesn't appear to like it very much, ending with Hiyono complaining to him.


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