彼方のアストラ / Kanata no Astra is a 5-book series with 5 primary works first released in 2016 with contributions by Kenta Shinohara and Gandalf Bartholomäus.
2016 • 1 Reader • 208 pages
2016 • 1 Reader • 242 pages
2017 • 1 Reader • 242 pages
2018 • 1 Reader • 288 pages