Hero System? But I'm in the Demon King's Army

At the Demon King's Army military tribunal.

The prosecutor demanded, "Rin Qi, why is it that every time you take part in a battle, all the other Demon King's Army units are wiped out, while the troops under your command survive intact to the end?"

Rin Qi replied, "How is it my fault they're so weak? Besides, just answer me this: did we win or not?"

The prosecutor said, "At this rate, you'll get the entire Demon King's Army wiped out."

Rin Qi replied, "It's fine. I'll rebuild the Demon King's Army!"

"What?"

"I can't help it. I'm in the Demon King's Army, but I awakened the Hero System. If I don't screw over my teammates, how am I supposed to climb from ghoul to Lord of the Undead?"