Isekai ni Teni shitara Yama no Naka datta. Handou de Tsuyosa yori mo Kaitekisa wo Erabimashita.

異世界に転移したら山の中だった。反動で強さよりも快適さを選びました。

by Sora Tsutaya, Jaga Butter

One summer day, Jin Konohana, a boy conscripted by his insolent sister to carry her belongings to a fireworks show, suddenly notices he is on a strange mountain. Alone in the mountains, Jin begins a life of survival. He wants to discard all troublesome things and live in peace and comfort.