Another World with My Knowledge

Prologue

Yo! I'm Hiroshi, Masamune.

I am here with Kami-sama san. I will describe this moment briefly okay? I got summoned by this Kami-sama to solve his humanities' hardest puzzle...

This room, which we are sitting, has no walls. It looks like a plain room to me at first sight; tatami mats, a kotatsu, two huge bookshelves, an electronic lamp... Nothing less from a regular japanese room. But the shocking fact is that WE are in a somewhat regular room in the sky. Yes, in the sky. And the one sitting in front of me is an uncle who is sipping tea with a horrible face. An uncle whose name is... Kami-sama. Now, let me describe myself a bit. I am Masamune Hiroshi, a highschool freshman AND a prodigy. Kami-sama san has summoned me to try to solve his puzzle. It is pretty easy. You just need to cross that x then add 3 to the y... blahblahblah...

One eternity later

Yeah! I consider it easy for me! But the thing is that Kami-sama did not expect me to solve it, not to mention in split seconds.

"You are incredible, Hiroshi. Of all the people I know, you are the only one who can solve this puzzle"

"Um... Thank you?"

"Well then, I will grant you one wish"

"Then can you send me home?"

"I am afraid that I cannot do that. I summoned you here and already deleted your presence in your old world"

"Ah..."

              Wait! Why am I not even surprised for one bit!?

"Wait! You serious Kami-sama san?"

"Yes, I cannot send you back to
your original world. But I can send you to another world and give you an over-powered ability as an apology"

"So..."

"Ah! My apologies! You have high intelligence enough to be anything. So I will give you 10 class slots and some other skills for you to use too"

"Eh? Ehh~~~"

                Everything around turn to a blur and eventually to white. I closed my eyes and prayed for help. Suddenly I feel like I am on a flat surface. I opened my eyes again and saw something unbelievable.

Grass Field As Far As The Horizon