As an "exclusive" or standard DLsite release, it is purchasable digitally. The text is primarily in Japanese, though fan translations often exist for popular works in this genre.
The "RJ" code is a unique identifier used by DLsite to catalog works; searching this code directly on their platform will lead you to the official product page, creator information, and system requirements. ⚠️ Important Considerations darekaramo ninshiki sarenai sekai rj01348401 exclusive