Ruten no Terma
The Wheel of Life

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Gathered some.
(Also thanks to tzippurah)

To have an easier view on the manga relations of the club, here's the fourth stack of manga, from O to S.

!! Almost all of the manga in this stack were moved to the 5th stack (except Sousei no Taiga - Super Doctor K).

The four other stacks are:
1-E: https://myanimelist.net/stacks/344
F-Ko: https://myanimelist.net/stacks/349
Ku-N: https://myanimelist.net/stacks/357
T-Z: https://myanimelist.net/stacks/22247

+++
First manga in the stack has been changed to Ojisan wa Kawaii Mono ga Osuki. instead of Olimpos (Feb 18)

Almost none of them have magic or pure fantasy elements*.
Not always adventure, but at least they show very secluded areas and/or gorgeous landscapes.

*These two do have a fair amount of fantasy:
Hisakata no Oto & Lindbergh

While it might look like you don't really need to know all of this, you never know when it will be useful: for instance with quizzes, random questions that you wouldn't know the answer to otherwise, fun facts to tell someone else, or if there's trouble or necessity of intervention in your vicinity.

=> Stack (1/2): https://myanimelist.net/stacks/9663

Honorable mentions:
-Apocalypse no Toride is a horror manga that could be included due to a couple of educational parts, such as acute hypoglycemia (low blood sugar) and its effects induced by intravenous insulin injections; however a lot of it is not really fitting to be put in here.
-Genius Martial Arts Trainer (MAL ID 170657): Fitness

(Also thanks to Lylaaz and abystoma2)