Event at Umeda Sky Building - "Sky Garden and Moon Prayer" - Teyvat Tour, sticker received upon entry. Price may increase after September 30th. The serial code on the back for in-game items is unused. When purchasing for the purpose of using the serial code, please first check the exchange instructions from the game website or the relevant event page at Umeda Sky Building's "Admission Benefits." There are five items, such as "1. Before exchanging, log in to your account and confirm whether you have already created a character in the game, (etc.)."