The KOICHI DOMOTO OFFICIAL APP is a dedicated mobile application for fans of Koichi Domoto, providing a range of features aimed at enhancing fan engagement. Users can access the latest news, merchandise information, and exclusive fan club content. The app includes a unique message content feature called 'ROOM', where users can receive personal messages from Koichi Domoto himself, although this feature is available through a monthly subscription.

Additional functionalities include a calendar that displays Koichi's appearances, allowing fans to stay updated on events. Furthermore, users can receive push notifications about new updates and fan club activities. The app is free to download, but the 'ROOM' service requires a monthly fee of 500 yen, which is automatically renewed unless canceled. This app serves as a comprehensive hub for fans to connect with their favorite artist.