The Vesperonii rrat doesn't make sense.
Kronii is not romantically interested in men. But ok, that's a whole different can of worms. Let us for a moment take some extra potent imagination pills and stretch our imaginations to the limit and asume Kronii is into men, and let us then stretch it even beyond and assume she's into men like Vesper(lmao).
1st let's be clear about the rrat and its evidence. The rrat is that Kronii and Vesper were dating eachother and at some point Vesper ditched Kronii to get on with Fauna(this requires further stretching of the imagination) or was cheating on her with Fauna and was caught. This rrat would explain why Kronii decided to unperson both of them, the rrat is supposedly supported by the "confirmation" of Vesperfau.
There are several problems with this narrative.
1: Kronii is against workplace relationships:
https://www.youtube.com/live/QUPjHbpJ0YY?t=10768s. She would never date a co-worker.
2: The timeline doesn't fit, if the rrat were true, Kronii would have gotten angry at them at the same time, but that's not how it happened, she got angry at Vesper and Magni mid 2023 and at Fauna early 2024. This fits in with a work related dispute with Vesper.
3: Some of the girls are angry at Nimi, and others are not. Gura, Kiara, and Mumei are not angry at Fauna, if Fauna had stolen Kronii's man, I don't think anyone would have forgiven her.
4: There's no evidence Kronii had any interest in Vesper, she never complimented him, asked him a personal question, or talked about him unprompted, she never took interest in any of his hobbies or adopted any of his expressions or mannerisms. Their collabs were rather cold and awkward. The biggest "vesperonii" moment was her laughing at her own mistake, not at his jokes.
What most likely happened is that Vesper did something that greatly ofended Kronii, Calli, Ame, Ollie, Altare, etc. And Kronii got angry at Fauna for taking his side (by dating him). Also got angry at her because she hid their relationship and lied to her, this is assuming Vesperfau is even real. If it were false then it would indicate that she got angry at them for 2 unrelated reasons.