@DracoInduperator
Hmm, that sounds plausible. I mean, from the flashbacks we have seen so far, it looks like Hisui's family took a young Ryuusei in when he was lost and injured. The parents may or may not have known his background, though.
I'm so glad I started reading just after this chapter was released. Love the story so far, but I do wonder what is going on with Hana.
Thanks for the update!