nah this isn't AI. it's clearly just a lack of skill, and you can see that consistently throughout the whole manga. that's a human's touch! and i mean that with full admiration. this artist is putting their heart and soul into it.
that said, i'm not sure it's really hooked me. the dynamic is interesting, but i feel like it's lacking something...? maybe it's because, so far, mirei seems clearly uninterested. it'd be more fun if she started to fall, i think