A mysterious series of pop-up screens. Isekai system will tell you what level you currently are. They tell you How much exp you have gained, how much more exp you will need to level up. Isekai system will tell you what skills, materials, or drops you have acquired, aswell as basic information on any monsters you have noticed. Essentially, isekai system keeps you updated on the world around you, and everything you gain as new resident of this world