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Suisei was never really that close with her, She just kinda became friends because PPT was with her all the time and when one of your really good old friends starts clinging onto someone else it becomes a bit awkward.
Coco even said not long ago because they became neighbours they don't really see each other at all because you literally live next to each other which makes sense.
The best collab is definitely the Doukyouzu ASMR in the hotel.