As part of the 50th anniversary, the “Vol. 0” book, which contains all six versions of the first "Doraemon" episode, was published in 2019, becoming a best-seller at 600,000 copies.

Nobita and his friends under the waters of the Pacific Ocean. Gian and Suneo take Doraemon's underwater vehicle and travel through the Atlantic Ocean, trying to find a treasure ship. Along the way ...