Thanks, Etiquette
What do you get if you lend a spirit your umbrella? Thanks, of course! Especially if that spirit is Totoro, the spirit of the forest.
It's raining, so you lend Totoro your umbrella. As a thanks, he gives you a present wrapped in bamboo leaves.
れい
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So what did you receive as a thanks? You open it up, and there's a ray (れい) gun inside!
Thanks for the new ray gun, Totoro!