Diary From Another World (Reincarnate to Rule)

Let me tell you straight up, the mc here is ... how should I say it ... INTERESTING. After he was reborn into a world with a game system, our mc thought that the new world he got into is going to be like one of those isekai that he have to kill bosses to level up. But why is this world so different? Where are the other monsters, the bosses that he need to overcome? Is this really just a simple isekai? With a unique style of storytelling from the mc's own diaries and his master's degree in Isekai tropes being useless, how can our mc survive in his new world?