Mawarireki

"Mawarireki" is a daily calendar that is quietly sold in a corner of a shrine. It is said that if the person who buys it turns over a page every day for a year, they will be able to go to the day they wish to return to. The mysterious "Calendar Seller" will guide you through this "special day." What if you could make a fateful decision just once?

(Source: Comic Days, translated)