山下美月メッセージ is a lifestyle app available on iPhone developed by Sony Music Solutions Inc. This app offers a subscription-based service that provides exclusive messages including text, photos, and videos from 山下美月. Users can also send fan letters to 山下美月 through the app, ensuring privacy as letters are not visible to other users. Additionally, users can access the official website of 山下美月 through the app, ensuring they don't miss any official information. The app offers both free and paid services.

The subscription-based services include receiving messages from 山下美月 on a regular basis, with content such as text, photos, videos, and audio. Users can subscribe for 1 month at a price of 350円 (tax included) with automatic monthly renewal through their AppleID. Users can also send letters to 山下美月 for 160円 (tax included) per letter, with billing through their AppleID.