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

With a mixture of curiosity and impatience, Sora wasn't quite sure what he was getting at with this second part of training. “What exactly will this second part consist of? Since the beginning, you've been going on and on about it, without really explaining what it's all about.” 


“Oh, I can see you're eager to learn more.” Jarek replied, keeping his air of satisfaction. “I hope you're happy because you're going to be able to use your skill this time.” 


Surprised, Sora put his hand on his sacred sword while dropping his training weapon. “My weapon skill?” 


“Of course, your weapon skill.” Resumed Jarek, who seemed surprised by Sora's ridiculous question. “What other skill would you like me to talk about given that you have no Ushi?” 


For a brief moment, Sora almost forgot that he was the only one who knew about his Collection and his Piercing Teeth skill. “Okay, but you said yourself it could be dangerous.” 


Heat, Ushi and Catalyst