Just to pray for protection. [Hibiki tilts his head.] And other things. You hang emas up with your wishes, and you give money as an offering so that the shrine's god'll hopefully make your wish come true. It doesn't always work though. They sell charms too, like for good health and love and things like that, and they work double if someone else buys it and gives it to you.

[Probably explains why all his good luck charms for superior grades don't work for him, but do wonders for the people he ends up passing them onto.]