After Selling the Memory of Her First Love, She Came to the Door

My name is Takigawa Naoya, I am twenty years old and heavily in debt. In order to pay off my debt, I participated in a memory experiment that looked suspicious at all costs. It is said that if you drink a drug called "greengreen", you can sell the memory of a certain person in your mind for money. Sounds like a scam, right? I think so too. But there is no way, my sister's tuition fees and the debt left by that bastard father will not wait for me. So I sold my childhood sweetheart. It doesn't hurt to sell someone who doesn't exist anyway, right? The morning after I got the money, the doorbell rang. Standing outside the door was a girl with shoulder-length black hair, gray-blue eyes, and a mole on the corner of her right eye. She dragged her suitcase and bowed slightly to me. "This is our first meeting. I am Suzuki Nao, and I will be responsible for your surveillance from today on. Please take care of me." … Huh? Immediately afterwards, I got a call from the research institute, saying that the rules of the experiment were as follows: within two months, let the supervisor lady take the initiative to say "I like you" to me. You can't confess your feelings, you can't leak secrets. If you succeed, all the money will be mine. Failure and all my memories will be erased. And this Miss Suzuki Nao in front of me - she doesn't know the rules. She just thought she was doing an ordinary surveillance job, huddled in the corner of my house every day and wrote observation records in a notebook. She often advised me to quit the experiment, saying, "You will regret it if you continue like this." I already regret it. But not for the reasons she mentioned. It's because I discovered that the memories I sold didn't seem to be all made up by me.