Just watched the episode. Ajisai is just absolutely boring, yeah. I thought that maybe her arc will start showing her in a different light, but so far no. Her voice, her reactions, her gestures, her emotions and looks, just everything screams (or rather whines with the most painstakingly boring intonation), "what a fucking perfectly boring girl".
And what's even worse, the whole narration is wanking over her, every single character is singing praises to her. Like the author wants you to love her, so she makes everyone say how good she is. It's the second time after Mamako from Okaa-san online when I see this level of wanking, and both times the actual character was just terribly boring.