[DeepL Translation - needs review] Volume 1 of 1: Because of a plane crash.... From today onwards, youth, a deserted island. ......! I don't have anything - I'll make anything! I eat everything!!!! (Crying) JK Survival on a Deserted Island with Wisdom and Courage. We're quite healthy! How to eat cicadas, how to make a trap, a simple allergy test, how to eat hermit crabs, and more....
(Translator: DeepL)
The vocabulary in Sounan desu ka is pretty diverse, and there's very little furigana. Volume 1 alone includes topics like food, animals, biology, disease, chemistry, physics, geography, and plenty of general survival stuff.
It's made easier by the fact that basically all of the unusual vocab is nouns and verbs. There are quite a few diagrams that can help with understanding how things relate to each other. The grammar is simple, and there's no unusual dialects. I sometimes found the educational commentary provided by the author to be pretty tough, though.