So I was wondering, why is this a prequel of Kizuna? I don't see any of the characters in there. Maybe cause I actually read Kizuna before this one but yeah....just wanna clear things up a little 😛

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K n e e l .... This is the difference between your and my eye-level.
Rai from Noblesse

Araki-san is Masa's brother. So Araki Hitoshi (from Hana to Ryuu) and Araki Masanori (from Kizuna) are brothers. Masa is with Kai in Kizuna and Araki-san and Ryuu are together too.