Liver Jam&POPO (Friendly Land)
wrote The Strongest Sage with the Weakest Crest 01
comprising 224 pages back in 2020.
Textbook and eTextbook are published under ISBN 1646090403 and 9781646090402.
Since then The Strongest Sage with the Weakest Crest 01 textbook
was available to sell back to BooksRun online for the top buyback price
or rent at the marketplace.