I looked down as the flame seemed to flicker a bit. I guess this body I have right now might be a part of my soul or something."I can...""You sure? Do you like my hug? Can you feel it?""I do...""You're such a good girl... don't worry, we can get through this together.""...Thanks."I decided to keep hugging this little vulnerable and weak light for as much as I slept. During this sleep, I asked her about various things, and she would answer whatever she knew.She said this guy that created her was named a "God of Transmigration", using his expertise over souls to send souls into other worlds that were in dire help for an otherworldly soul experienced in the "isekai genre" or whatever. While doing so, he gave them a system that he made, which varied in functions and features depending on the necessity.With that being said, she was crafted as the first system. She told me she was a "primitive leveling and class system" with nothing else going for her. Her main function was to help me extract energy from the souls and bodies of the living beings I slay and add it to my body and soul, effectively earning "EXP".