"Did you know? If the Diamonds are in danger, the 'Ace of a Century' will save us!"

My name is Yamamoto Ryuhei. I was the ace pitcher for the Aichi Diamonds, a team that has been in last place for ten years. Even in my sixth year, people still called me the 'Ace of a Century.' Everyone looked at me with high expectations.

That expectation was a burden. It was so hard, and contrary to what people expected, my mental state would shake, and I often made mistakes in important games.

But I had my beloved girlfriend, Kurosawa Ayaka.

And I had my younger sister, Yamamoto Saika, who would believe in me until the end. Because of them, I was able to keep from falling apart.

However, in the final game, which was the last chance for the Diamonds to escape last place... The bases were loaded. We only needed one more out.

I gave up a massive grand slam.

I was pulled from the mound immediately, and our team failed to turn the game around, confirming our last-place finish.

"I am trash... I am trash..."

I broke down after that final game. And the fans and the organization stopped believing I was the 'Ace of a Century.'

Then, Guest appeared. The same overall first-round pick as me. But he was different. His stability in tight situations, his strong mentality, his crisis management skills...

Unlike with me, all the fans believed the real 'Ace of a Century' had arrived. The organization even gave my number 1 to Guest and spared no effort in supporting him.

And just like that, my world began to be stolen by that guy bit by bit.