Well things go something like this ...

 Our protagonist. An absolutely cute but highly antisocial high school student magically ends up somewhere unknown.

 Who knows how? No fucking idea.

 The place is completely dark and the sound of the water is heard everywhere.

 As if that were not enough, she is not alone in that dark place.

 It's surrounded !!

 She is surrounded by strange creatures !!

 ....

 Sounds weird right?

 Are you interested in knowing how the shit got to such a place or the reason? So join me in this great story of a poor high school girl who will do what she can to survive.

 Ah! I forgot something, this girl is a gamer and they are eager to have fun in this world of ....