Cryptically titled “Vol. 0,” the first comic book in the original “Doraemon” manga series to come out in 23 years was released Dec. 1 to mark the 50th anniversary of the cultural phenomenon.

Published using the Tentomushi Comics imprint, 88 million copies of the popular “Doraemon” manga have been sold in Japan alone. The first volume, released in 1974, had 251 print runs.