Ks Room is an official app designed for fans of actor Kohhei Matsushita, providing a dedicated platform for interaction and engagement. Key features of the app include timely updates on event information, exclusive content like original videos, and special access to ticket pre-sales for members. Users can stay informed about Matsushita's latest appearances and participate in a vibrant community experience.

The app also allows fans to send personalized fan letters directly to Matsushita, enhancing the connection between the artist and his audience. While the app is free to download, access to certain features such as the Movie and FanLetter requires a paid membership. The annual subscription is priced at 7,200 yen, with additional charges for sending fan letters. This app aims to create a unique space where fans can enjoy exclusive experiences and content.