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

“The stuff you made me drink, what was it?” Sora replied, struggling to stay on his feet while keeping his balance. 


Jarek tossed his vial into the air and held it out in front of Sora as he caught it, and let a smirk appear on his face. “This is one of my new potions. I needed a guinea pig to test whether they work properly... And apparently they do.” 


Sora, his arms trembling slightly, looked at the vial Jarek had just handed him. The potion he'd just drunk seemed to have reduced his pain and fatigue in just a few seconds. His arm and stomach still hurt like hell, but it was now much more bearable. “In the future, I'd appreciate not being your guinea pig.” 


Jarek burst out laughing, a pleasant, casual sound that contrasted with the gravity of the situation. “You got off easy, didn't you? So stop grumbling, you're still alive, and even better than before.” 


Black Flash