A Far and Distant Seashore is the 21st chapter of the Dr. Slump manga.
Summary[]
Arale Norimaki, Akane Kimidori, Taro Soramame, and Peasuke Soramame use the Time Slipper to go swimming at a beach in the past. When a volcanic eruption begins, they leave in a hurry. Akane, Taro, and Peasuke arrive on a battlefield that seems to be World War II, while Arale arrives in Momotaro's timeline.