By sheer chance, Ace logs into the Black Tower Space Station and gets a special ability: a jar-smashing System.
With other people's jar-smashing, good stuff pours out in heaps. His jar-smashing System, though, has its own quirks.
Crack! A fragment pops out. The buyer takes one look and realizes they'll need to smash dozens more jars before they might have enough to combine into a complete item.
The catch is that each buyer can buy at most 20 jar-smashing attempts per week, so...
Herta: I hereby announce that we're expanding the space station's capacity. Everyone, get out there and smash jars!
Asta: Blue fragments, 10,000 each. Purple fragments, 100,000. Gold fragments, 1 million. If you're selling fragments in bulk, message me to negotiate.
Cocolia: Tch. That golden item, the so-called Planetary Environment Modification System, needs 99 more fragments before it's complete. Effective immediately, every citizen is to smash jars!
Kafka: Fragments of the Devil of Domination, how interesting...
Ace watched them, utterly unable to tear themselves away from the jars.
After thinking it over and over, he couldn't help feeling that something was off.