At some point, the people I called parents sold me to a research lab. My memories start from around age three. Every day was hell, and the screaming never stopped. I had to get injections daily, after which I was dragged somewhere and strapped into a chair that fixed my limbs. I'd faint with a feeling like electricity running through me, and when I woke up, I'd be in my solitary cell. Even at night, the children's screams never ended, and I had to endure them silently to sleep. There wasn't even a single window in the room, so I didn't know what a clear sky was, or what colors day and night were. Around the time I turned seven... I was not discarded, but dragged somewhere else.

The place I was taken to was a grand mansion. That was the first time I saw a clear sky, and after entering the mansion, I never saw it again. According to them, the experiment was a success, and I was the result. They said I would become a dog protecting the master of the mansion as a killing machine. While my mind was filled with the question 'Why?', a burly man, not one of the lab people, dragged me to a room. Without knowing anything, I began to learn assassination techniques and how to handle weapons from him. Whether what they said was true or not, I learned everything quickly and soon killed the self-proclaimed master who taught me. This was my first murder.

Once I killed that guy, the master of the mansion summoned me. This time, I wasn't dragged roughly. A person just followed at a distance behind me.

And so, I disposed of those pieces of trash—my parents—with my own hands. My childhood was spent continuously receiving and carrying out missions. My name, Luna (an alias), spread through the underworld, and when I turned 17, I received a mission to go to the JCC and kill three people. The time limit was three years, until they graduated. This was how I met the trio.