Only the current version so far — new entries appear as the app ships updates.
青空文庫リーダー is an entertainment app by Kumao.Works with 10,000+ downloads (about 18K estimated). +402 installs in the last 7 days. Install growth, rank history, SDKs and ad networks.
From the store listing: “This is a viewer app for Aozora Bunko. You can download and read your favorite works from the Aozora Bunko website.”