Yeah. My problem is that a lot of endings that are presented as bittersweet are actually tragic, by your definition. Mostly cause it's usually a "the main and/or everyone they love are completely screwed but hey the world didn't die. LOOK HOW HAPPY IT IS." type of scenario.
That's why I dislike the ending type. I don't like it when a story tells me how to feel when it's completely at odds with how I feel about it.
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No problem!
This is a cute and pop genocide of love!