cotoru is a free Android app developed by VAJデジタルデザイン株式会社 that simplifies the process of entering prepaid card campaign codes. Instead of manually entering thedigit code required for registration and entry, users can scan the barcode with their phone's camera, and cotoru will automatically reflect the code in the corresponding input field on the campaign webpage.

Before using the app for the first time, users must allow cotoru to access their phone's camera. Upon opening the app, users are prompted to register their email address, which will be reflected on the campaign webpage's email input field.

Using cotoru is simple. After opening the app, users can scan the barcode on their prepaid card, select the campaign they wish to participate in, and answer any required questions or surveys. Users should verify that their email address and barcode number are properly reflected on the campaign webpage before submitting their entry.

Please note that cotoru is an input support app for campaign webpages, and users should refer to the individual campaign pages for further details.