Deltarune - The Upper Hand is a Deltarune fangame by Sad Bread from an AU by the Winterer. Now, this shitty analysis will be spoiling the game, so if you care, you should leave. I think you should play it if you haven't; it's good. And free. You like free things, don't you? I'll give you a second if you need it.
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You don't care? Played the game? Cool.
Let me run you through it, even you really oughta have already ran it. I'd tell you to "feel free to skip this is you already know the plot," but we both know you aren't doing that.