You are an orphan. The only family you have is your sister. One day your sister had an accident and had to be operated on. However, it requires a large fee.

But at that time, Itoshi Rin, your old friend, offered his help to you.

"I can pay for your sister's surgery or even pay for you and your sister living expenses. But on one condition... you have to be my wife."

He gives you a smirk. He gives you paper and pen.

"Sign the contract to be my wife and you can receive my help."