Reincarnated into the world of "Until Then"

A fan of the game of until then gets transported into the world of Until then, With the help of his system how will he act as his favorite game became his reality and what action will he do in this world as he is sucked into the mess of this world, while trying to build relations, friendship, and finding ways to help in this alternating mess of the world of this reality. Note: This is only a fanfiction, everything that i use comes from the game, such as the characters and locations.