ENigmatic Isekai Recollection

Nathan didn't know what he was expecting, but it certainly wasn't seeing the news reporting 19 missing people from the company known as Hololive, mainly the English branch. He wondered how such a large group of girls could just vanish without a trace, I mean, yeah his world isn't exactly normal, and neither were they, but even this is classified as strange, right? He decided to shrug it off, thinking it wasn't a big deal, not to mention, what can he do? He's a mere human after all. Suddenly, after taking a small nap, he wakes up, not in his bed, but in a field, wearing his school clothes, but with no recollection as to how he got here, but to his bigger surprise, his stepsister Annabelle, or Anna, is there with him as well, also not knowing how she got there. After going to a nearby village, the two of them learn that they're in the Kingdom of Libestal, a Kingdom showcasing things he thought he would never see, unfortunately for them, they came at a bad time, as the Kingdom was in the middle of a major conflict, and was sort of asked, by the Leader of the Kingdom, to help them out, but to everyone's shock, Nathan refused. He said that they can lock him up and torture him, but he refuses to play any part of this, saying he doesn't want to be some, savior, he wants to return home to his family, Anna agrees with him, since she trusted him. With that, they walked out, heading straight towards the village they recently visited, not daring, or caring, to look back. As they got there, they started to realize, that neither of them might not have a choice, as since both didn't have a way to get back home, maybe helping them out would give them some answers. With that in mind, the two, along with two others, decides that they'll fight, not for the Kingdom, not for the villages, not for the people, not for the land, but for themselves.