I love how the ending blow is almost a mirror image of Poseidon vs Kojiro: the god attacking from above while dismembered while the human uses both their hands in an attack aimed at the god's chest.
Was this meant to be cute or heartwarming? It just left me feeling like the sister was an absolutely abhorrent person. I was fully expecting it to take a dark turn with the brother killing the sister out of anger or some such thing.