[Crossover] I Was Bound to a System While in the Hospital

(Note: There will be OOC.)

I am Yukimura Seiichi, the top tennis player in middle school, known as the Child of God.

At the end of October, I collapsed on the station platform. After I was taken to the hospital, they suspected Guillain-Barre syndrome. Just as I thought I'd never be able to play tennis again, a System calling itself Defy the Heavens came to me.

[Hello, Master Yukimura! I'm Defy the Heavens. It's a pleasure to work with you!]

Yukimura: "? What are you?"

[How mean! I'm not a thing! Wait, that's not right... I am a thing! Huh? Something feels off...]

Yukimura: "Please get to the point :)"

[Oh, right. That's a scary smile! So, Master Yukimura, would you like to keep playing tennis?]

Yukimura paused, then nodded firmly. "Of course. Tennis is part of who I am!"

[Yes, yes, very good! What a wonderful answer. Now, please sign this contract. Once you complete what's written in it, your body will recover quickly!]

Just an idea! Maybe I'll get to it sooner than expected?

The master's golden finger will differ from world to world~

P.S. The System's lines are all in [ ]

Theme: For the sake of my beloved Master