Is There Something Wrong with This Hero?

Andersen stands in the Demon Lord’s domain. This is a crucial battle for him, and he is only one step away from defeating the Demon King. There’s just one problem…

“System, let’s make a deal. Lend me some power, and I’ll pay you back once I defeat the enemy.”

“Agreed.”

“Really? I knew you wouldn’t just stand by and let the Demon King kill me. Demon King over there, taste my holy sword!”

“Host has successfully borrowed 50 years of lifespan. Non-refundable. Repayment requires ten times the negative energy.”

“Damn it!”