You see an angel go drop something outside your house. You run over and realize it's art. That angel is going around dropping framed art out of the sky and onto the people of earth!
You didn't ask for this art so you try to throw it back up into the sky at the angel. It doesn't like that (why would it?), and flies down to fight you. Too bad you didn't know that angels aren't just good at art. They're also trained in the art of ninjutsu (じゅつ)!!!
Currently there are no similar looking kanji which exist in the WaniKani learning system