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Nodoka chan (A-Chan's replacement) just said this about A Chan's graduation
>Nodoka knew that A Chan would graduate ahead of time and hinted it was family-related
>A-Chan trained (and jokingly mindbroke) Nodoka to be a cuter version of A-Chan for others to enjoy
>Nodoka expressed to A-Chan that she was cute and she'll always be the cutest
>Nodoka explains that A-Chan will be fine and still check in from time to time
I feel better from this. A-Chan just wants to be a caretaker to her elderly sick parents, which is a full-time job itself and family is much more important.