How did you get that I was blaming Yuu out of what I wrote?
Because this
My sentence was structured poorly
Thanks for admit it
I just intended to point out that the version of events Yuu gave to Haru paints a better picture of Aya than Aya's would b/c Yuu doesn't know that Aya knew Hikari saw them & Yuu doesn't know that Aya knew he'd be at school & Yuu doesn't know how long Aya's known that Hikari is the girl he likes (like you point out, Haru is the one who's figured out the timeline b/c of the carnival, Yuu would have had no way to observe a difference in Aya). ETA: legit, wasn't holding his ignorance against him.
Yuu knew because Yami herself said to him during their initial dialogues in chapter 40, Yami says to Yuu she already knew "from a little time ago" he was "Taa-kun" and the "boyfriend" of Hikari, even if, of course, he doesn´t figure out the correct timeline.
Right now, the things Yami could have omitted are things who Hikari nor Yuu (and probably nobody more either) doesn´t know, and maybe they will never learn about them.
Yami knew that Yuu liked someone else when she first made a move for him
I mean, "I helped him to really fell in love, got over his first crush, and left of simping for a childhood friend who didn´t reciprocate him" (and again, this is the only one thing Hikari didn´t try to deny in her confrontation with Yami) is probably one of the best things Ayami ever did and probably those boys would have agree with her in that point.
Other thing, to be fair, is Yami securely never said to nobody her original intent when she carried Yuu to the love hotel was "I want to corrupt and destroy this innocent child", even if, again, that was only one of her tsundere deviations to deny she was starting for feel something for Yuu.
All of which is to say that Aya could easily give a "true" version of events that painted her in a more sympathetic light.
I mean, Ayami is definitely a character who gains a lot when we don´t have access to her edgy thoughts (thoughts are not entirely reliable of her real emotions because she is a tsundere, to be fair), as we could see in Hikari and Yuu PoVs. This definitely would explain why Kamiya in Shikimori-san, being a similar character, is always seen from the point of view of the MC Yuu Izumi, the FMC Miyako Shikimori or her best friend Kyou Nekozaki -one of the base characters behind Hikari-. The only brief glimpses from Kamiya inner mind definitely are very dark and worthy of Ayami.