"Yukimura, let's go."

"Yes, Arisugawa-Sempai!"

　After school, Minto Usagi and Arisugawa Tatsuya invite their younger colleague Shogo Yukimura to play catch with them.

"Usagi-senpai, let's go!"

"Come on, Shogo."

"Hoi!"

　Yukimura grabbed the ball and threw it away, and Usagi grabbed it and rolled it around in his hands.

"Usagi, hurry up and throw it."

"Arisugawa has a temper, doesn't he? Time doesn't exist, so let's be more patient."

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"Here we go again..."

　Arisugawa urged him to do so, but he was toyed with by Usagi as well as the ball.

"Hey, you two. We're making a big triangle, but where is the Lagrange point?"

"What?"

"The point where the balance of forces is perfectly balanced. In physics, as soon as there are more than three substances, it becomes difficult to calculate it. It's the biggest challenge since classical mechanics."

"This is the point at which the Lagrangian function becomes stationary, as it is called in analytical mechanics. In high school mathematics, it's the point where the derivative of an extreme value becomes zero."

"Hey, Yukimura. Don't hang out with him."

"Because Usagi-Sempai's stories are very interesting."

"Cute, Yukimura. Arisugawa is dumb, so don't be like him."

"Hey, I can hear you!"

　Usagi finally released the ball to Arisugawa.

"Hey, Arisugawa. Let's go look for our Lagrange point."

"What?"

"Wouldn't it be great if we could figure out what Newton couldn't?"

"Uh..."

"Where the hell is it?"

"Well, it's in our minds, I guess."

"Oh, Usagi-Sempai, That's great!"

"That's so stupid..."

　And so the three of us continued to throw the ball as if we were going to do so until the end of the world, not paying attention to the setting sun.