Unlocking the System

Hajime Kazuma, a high school student with a normal boring life suddenly reawakened inside his room after saving a young girl from getting run over by a speeding truck, but something was off. [System Booting: Host found- Hajime Kazuma: Welcome…] After reawaken in his room Hajime can now see a holographic screen in his view with multiple sets of displays and mission objectives popping in all directions. He now can do things he could never thought possible and see things that he seen before. His life will be forever changed as the system takes over his life. How would he use the system? And what mayhem can it cause?