From MangaHelpers:
After a terrible earthquake, Satoru wakes up in a pitch black cave that him and his friends were exploring. Desperately moving through the crumbling cave with just his backpack, he expects a warm rescue once he gets out. But what awaits Satoru was an unbelievable fact: Japan has sunk underwater due to the earthquake and he is stranded on an island with no one to help him. Can Satoru learn how to survive by himself?
22 Volumes (Complete, by Shougakukan in 1977)
16 Volumes + 1 Bonus Vol. (Reprint, by Leed in 1988)
6 Volumes + 1 Bonus Vol. (Wide-ban, by Leed in 1994)
20 Volumes + 1 Bonus Vol. (Konbini-ban, by Leed in 2000?)
10 Volumes +1 Bonus Vol. (Bunkoban, by Leed in 2001)
10 Volumes + 1 Bonus Vol. (Konbini-ban, by Leed in 2005)
7 Volumes +1 Bonus Vol. (Konbini-ban, by Leed in 2009)
8 Volumes (Hardcover, by Leed in ?)
11 Volumes (Shogakukan, 2017)





