How Do I Save the World With a Rhythm Game Gacha System

[Liu Xu, 21, former child star, graduated from a professional arts academy, task executor aptitude assessment: perfect] Looking at this nearly perfect resume, the Systems in the Main God Space were rubbing their hands in anticipation, each declaring that they wanted to bind with this executor. However... Main System: What games are you good at? Liu Xu (confidently): I'm amazing at rhythm games! The Systems who had come for that perfect resume looked at each other and all took a synchronized step backward, leaving behind 079, who had no idea what was going on. Liu Xu (choking back tears): Did you really just take a step back? Main System: Great! Many thanks to 079 for the sacrifice. The secret identity gacha function has been sent. Best of luck with your binding. 079: ...? Looking back in confusion, 079 finally realized its colleagues had sold it out. Wearing an expression of utter disbelief, it accepted the rhythm-game gacha function sent by the Main System and bound itself to Liu Xu. After preparing itself for every possible scenario, 079 greeted its new Host with a polite smile. 079: Hello, Liu Xu. I'm your System. You can call me 079. My official name is [World-Saving System]. I look forward to working with you for the rest of your life. Liu Xu (staring like a confused old man on the subway): ...Wait, what kind of System are you? 079 (smiling): The World-Saving System. My mission is to save the world! Liu Xu looked down at the card pool for his rhythm-game secret identity, his eyes going wide. Wait, how am I supposed to save the world with a rhythm-game card pool?!!! (reaches out in despair) Rhythm-game card pool: Ensemble Stars!! Music (with special changes. Surely you don't really want to see the protagonist sing to save the world, right?) P.S. Ensemble Stars (ES) is a game about idols, but its characters develop in some pretty absurd directions beyond that. I originally planned to write about Gojo's older sister, but after what happened with JJK, I decided it would be best to avoid that, so I changed it to this. If you like the ES characters, give this a look. I'll do my best to bring them to life! Authors are fragile creatures, so please treat me gently and carefully. Theme: Keep doing your best today, too!