Have I Been Saving the Villain Today?

I was born mentally disabled. When my mind finally cleared, I saw my cousin tying me to a red chair. My aunt's impatient voice rang in my ear: "Hurry up. The Taoist said tonight is the best time for the life exchange to succeed." My cousin quickly replied, "Okay, Mom." She pulled the rope tighter, leaving red marks on my skin... I struggled to get free, but the cloth in my mouth stopped me from speaking. ...

My cousin exchanged our lives, and I was made to take her place in a horror game. My family was cursed: everyone who turns eighteen is forced to enter the game... And now I'm the one entering it...

All I want to say is: "Thank you for being here. Because of you, every season feels warm."

System: "Want to survive? Want to reach the pinnacle of life? Bind yourself to System 58 now. You won't lose out, and you won't be taken for a ride."

Me...

"I thought you were a survival system. I never expected you to be a dating system."

First game: Adorable Little Cutie: "Sis, save me! I don't want to be eaten by the monster."

Second game: Unhinged Boy: "Sis, I'm not crazy. Believe me."

"Hmm, where's my villain today?"

"System! I'm working seriously."

"This counts as overtime. System, give me extra points."