Like… COME ON. It’s a neon sign pointing directly at her. But that’s exactly why I don’t buy it.

Maybe you’re right, but at the same time, this anime isn’t all that clever. Like, she put no effort into protecting Kougetsu. Also, listen to “Gayou” and tell me that’s not Noble Consort Shu’s voice.

If it’s not her, the only possibility is that she’s being framed in a similar way to Reirin and Kougetsu. There’s just no likely candidates for this, unless they start introducing them now (which would be lame tbh).

And that leaves one clan that has come out of this whole thing remarkably clean: The Blue clan.

That feels like a stretch tbh. There’s nothing established about the Blue clan and their relations with the other clans. It’d be quite an asspull.