The more you sleep the more you get stronger~~
My grimoire give me new skills and magic as I wake up every day! Everyone else tries hard to memorise and understand their grimoire and gain new Magic or skill, But for me, I get them automatically.
What I get all depends on my luck, but I can easily acquire Highest tier magic sometimes. While holding onto the grimoire like this, I enjoy my time in another world with my wife and friends that I made here.