a mission only i can complete!

Im face to face with the demon king, the most evil and powerful creature in all existence, after he eradicated the human race in a day i was the only one that remained, blood drips down my forehead and blinds my right eye, if only i was stroner maybe i could've saved humanity. The demon king thrusts his sword into my chest and i cough up blood,

"You fought well, you can die proud" but im not ready to die just yet! I walk forward, the sword stabbing deeper and deeper until im at the hilt, im inches from the demon kings face, i raise my fist and with my remaining strength i punch him, he doesn't even flinch.

"Hahaha you still have some fight left in you human! It would be a shame to see your light die out so soon!" The demon king grabs my head, his giant fingers wrapping all the way around my skull,

"ive been waiting for a creature with your potential for a thousand years, dont disappoint me human!" His hand clenches and my head pops like a balloon full of blood.

Part 1: my new system!

I wake up in my room, no wounds are present on my body, i thought the demon king killed me?

"The god system unlocked" a voice sounds out in my head, i look around frantically for the source

"Whos there!"

"You have one new objective" suddenly a floating screen appears in front of me, i see my name, Rōgan uzumaki and next to it the words "level 7"

"I have a level?"

"Your level will increase as you complete tasks and defeat enemies, you have one new objective" complete tasks? Well i should probably see what this objective is all about, maybe that will give me a clue as to whats going on.

"Whats my objective" i say aloud and the screen swaps, across the top it says main objective and just under it says sub objectives, i decide to start with the former.

"Show my main objective" a drop down menu appears underneath the main objective tab, and it says, defeat the demon king. So thats what this is, ive been sent back in time with a system and given a second chance at beating the demon king. This is my destiny

"Show sub objectives" another menu drops down and all i see is one mission, it says to spend my skill points, so i have skills now it seems,

"Spend skill points" a new menu opens and i can see my stats, everything is at one despite my level being 7, i decide to dump the ten skill points i have available into strength, dexterity, and intelligence, with a focus on strength. Nothing happens,

"Sub objective completed, new objective acquired" the objectives screen opens automatically this time, my new objective confuses me a bit, its very vague, it says, win a fight.