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Planning?, no, thinking about it?, probably, not in the "I'm rich and tired of this I don't want to be an idol anymore" way, but in the "I love being a vtuber idol but for how long can I do it being ill like this?" way. It's obvious that it wasn't an easy decision and she took her sweet time arriving at a decision, and she decided to leave in glory during one of he best years instead of whitering away and slowly fading while leeching and abusing her fans goodwill.
It sucks but it's totally understandable, life is just awful like this sometimes but let's be glad that we got to know and experience Amane Kanata the idol instead of never having the pleasure of masturbating to her perfect DFC and juicy, tight ass.