"I was supposed to live a free life, but this life has given me a lot of debts to pay... and I suddenly become a host of a parasite."

A poor girl with absolutely no support from anybody.. and has an  enormous ampunt of debts to pay left by her parents.. Having to reach at the age of 15 she notices some weird changes in her environment like when she passes by an object.. it will fall when no one even touches it. Starting on a new school, she then met a man whose age is about the same as hers.. but that man suddenly sticks with her.. entirely