Always bring the garbage to a hut or carry it out with you. Don't pollute the water and springs. Water is very precious in the mountains. Please don't pollute the water with detergents or leftovers. Use the water only for drinking.
Some huts provide drinking water for sale.
For safe mountain climbing. The weather is constantly changing in the Japanese mountains. Especially in the summer, the mornings are clear, but the afternoons bring bad weather and this necessitates caution. The distance between huts is long in the Southern Alps, so leaves early, rest and try to reach the huts at between 3 and 4 p.m. Make sure you know the name of the mountain or your destination in Japanese trail signs are in Japanese.