When six unlucky grudges went to the beach to play, they thought of themselves as immortals, which triggered a huge tsunami, and soon the water filled the mountains. They were carrying first-aid supplies and drifting in the bathtub like others, but a wave of waves blew them to the sea, so... They began to wander on the sea.
The protagonist is introduced in Traveling Through Ancient Times
Written by the author who had a brain attack
Purpose: funny girl