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POSITIVE RRAT: Fishman actually got in contact with Hina so he knows the whole story and that Hina doesn't intend to leave (although she's really going through tough times so she asked for more time). He cooked up this whole half-complete anniversary setup so he can complete it when she comes back (and sell more merch). The reason why the rest of the gen doesn't know/want to say all details is because it's heavy personal matters and Hina is very depressed about them.
tl;dr be patient, good news come to those who don't give up hope.
