Action/adventure

After a huge earthquake, a boy finds himself stranded on a small island only to find that Japan has sunk. And is determined to find his family.
Really nice art kind of like in a western comic format? Idk
Words are really small tho
Incomplete and a rewrite of another of the author’s manga which has a different art style (those old types of style) and featuring a boy instead of a young man (apparently misses quite a few details from the original too)
Author/illustrator of Japan sinks

Chp42