The 藤木直人オフィシャルファンクラブアプリ FBI is a dedicated application for fans of Naohito Fujiki, a prominent figure in entertainment. This app provides exclusive access to real-time information about his activities, including television appearances, events, and behind-the-scenes content that is not available elsewhere. Users can create special moments with Fujiki through unique features designed to enhance the fan experience.

Key features include the Information section for updates on appearances and events, the NOW NAO feature offering glimpses into Fujiki's daily life through photos and videos, and the LETTER feature that allows users to send personalized messages to him. While the app is free to download, certain features require a paid membership, offering additional content and interactions for dedicated fans.