The Gap Youkai. If you don't know about her, well... you're human. You probably wouldn't. Consider yourself lucky.

[She shuddered and stopped walking pulling her hands up and clutching at herself. Look, Yukari Yakumo was arguably one of the most powerful creatures in all of Gensokyo and the heavens. Her laziness was the only thing that outstripped her raw powers, which was how the annoying little know-it-all and nosy little busy body avoided causing even bigger trouble than she already did.]

She controls and manipulates all boundaries. So, when one gets breached, like whatever happened to bring me here? Yeah... she'll get involved eventually.

No way am I getting held responsible for that shit. I know better than to cross her.