From this story, you should expect a non-Eastern (Japanese/Chinese) and non-Western (European/American) oriented medieval setting that includes a protagonist that does not belong to the setting.

Lonely Mountain name has many meanings. One of them is the meaning of the male protagonist being the lonely mountain himself, being as lonely but like a mountain for his chosen sisters and brothers in arms. Another one is the name that he gives to the place he finds himself, a lonely mountain in a vast plain. 

The isekai element of the story comes from the male protagonist's traveler status. Naturally, different values, different customs, and conflicts between them should be expected. Foreign words, concepts, idioms, legends, and sometimes even cultural norms are going to be explored. As I have already said, none of these would be European or Japanese for reasons I am going to explain in the future. Therefore, please ask for anything that is not explained properly inside of the story because no translation is perfect especially when the underlying culture is too different.

The litrpg element of the story comes from the restraint named as the "system" that was already put on the protagonist's awakened sub-consciousness. It is not a system that you have read in other stories. It is a willing choice of the protagonist that restricts his power but also protects him. There is too much underlying content about this element of the story other than what is first observed, but all of it would be explained in time.

Thus, expect an isekai that is not isekai and a litrpg that is not litrpg. Confusing? It has not even started yet.