Kokuro

After receiving a message from Rin ASHIBA, the girl he's in love with, Sora ISOSHI goes to a classroom at his high school where Rin had asked him to meet. But when he gets to the classroom, he finds himself alone. Thinking it was a joke, he leaves the room, but once outside, in what should be the corridor of his high school, he sees instead a large white room where, sitting on a throne at the back of the room, is Rin ASHIBA.

She tells him that he has been chosen by the Tower to try and climb it and become its new king.

But as he wasn't born into this world, he doesn't have the ability to use what all the inhabitants of the planet are able to use, the Ushi.

So Sora is given a strange power. A power with which he will try to climb the Tower, trying to fulfil Rin's wish and thus become the new King of the Tower.

The Tower King

Sora ignored the pique and stepped forward, revealing his blackened arm beneath his shirt. "I need your help. My arm's in bad shape, and I can't afford to waste time with natural healing." 


Ideor raised an eyebrow at the damage. "Hmm... You've been playing with fire, literally, it seems. I may have something for you, but I'm warning you right now, don't expect your arm to be as good as new in a few moments." He turned away and began rummaging among his shelves. 


A few moments later, he returned with a small vial filled with a brilliant red liquid. "This is a minor regeneration potion. It should be enough to heal superficial burns and relieve pain. But with just one dose, it won't be able to repair your more deeply damaged tissues." 


Sora held out a hesitant hand. “How much will it take for me to heal completely?” 


Supervised Training