There are two scenes that play if Ayane's affection is high enough. The first one is "scientific research" a main event in chapter 1. Akira goes to the beach and can spend time with Chika, Yumi or Chinami (or Himawari, if Ayane's affection is high enough).
You can only get this one through cheating though, and you'll get a cheater flag for it.
The second one is during the "miserably ever after" main event in chapter 4, where you can choose a 4th song if Ayane's affection is high enough, the songs starts playing a bit later. This doesn't give you a cheater flag, and it's one of the reasons people assume the narrator for the event is Himawari.
What has been said about the Sana scene at the beach is not based in Ayane's affection, but if you're having sex with Sara (iirc). It's either "ad meliora" or "ad infinitum".
If you view either event on replay and have URM, just choose the option when it pops up, there's no need to manually trigger either of the events. You will have to manually trigger "flowerchild" if you want to see Himawari at the end again, so the manually triggering is true for some cases, just not these ones.