For many Japanese, it is customary to visit a shrine or temple especially at the beginning of a new year to express their gratitude and offer prayers. There are certain rules and manners to observe in order to be allowed into the sacred space of the deities. You do not have to worry too much though, as there will be no punishment even if you break the rules. Just make sure that, when you offer money, you put it quietly into the offertory box instead of throwing it in. The amount of money can be as small as one yen, and foreign currencies are also welcome. Ritsu put a 100-yen coin out of her modest savings in a prayer for the quick recovery of his ill grandpa.