Alright, let's get around to judging.

John is accepted. 

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Age is simplified. Check.

Powers are neatly explained. Check. 

World is better explained. Check. 

As for the backstory... This is where I run into some problems.Instead of running away due to fear of being abused by her parents, she instead ran away because she screwed up one single chore. The next part was okay, but then there's the driven to suicide bit. What exactly is she punishing herself for? She essentially made a potion for the intent of having her suffer through every painful moment of her life before dying... Why? I mean, it would make sense she would try to commit suicide after her love has died, but couple this with the running away because she messed up with her chores, it just makes it... Well, I mentioned before how the previous back story just seemed to be over-the-top, and here, it's over-the-top for a different reason. Now it's [i]Haika[/i] that's going over-the-top.

"Welp, my love died. Time for me to make myself suffer a horrible and painful death." 

I do like her realization that she has a second shot at life, but everything else just seems... unnecessary? The grammar has improved, I will admit. It's fixed, but there's still a bit more to fix.