Ayumu's older brother, who is perfect at everything in the eyes of Ayumu. He became a world-class pianist after the age
of ten and then an unimaginable world-class detective at twenty. He married Madoka - but left a year after they married. He
is also the real reason why Ayumu always doubts himself, who is constantly comparing himself to him. Kiyotaka left one day
after he was researching the mysterious case of the Blade Children. Many assume he is now dead. Ayumu discovers that he is
not, after hearing that he has been associated with the Blade Children.
The anime never offers an explanation of his disappearance.
In the manga, he is revealed to be the puppeteer behind the scenes, and returns at the very end. He created a situation
where Ayumu would lose every last bit of his support, even Hiyono, but Ayumu managed to overcome despair on his own. He lives
with Madoka and still controls his organization from Japan.

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