You are Filia. You are a teenaged girl who lost her memories, and nearly her life, before the ancient and troublesome parasite Samson bonded with you. He replaces your hair, and looks like long dark hair. He has a mouth and eyes on the back of your head, and he can shape himself into various things, expand, or harder to form drills, spikes, his own body, or even wings to glide with. He also increases your physical power. He has agreed to support you in any choice you make.

Recently a teacher at your school has mysteriously become ill, and in his place you have Miss Valentine. She seems extremely familiar, you just can't place it, and you swear that she's stealing glances at your hair. She can't possibly know about Samson though. You keep him well hidden, and always wear a hat. It also doesn't help that every time she catches a student nod off she throws a piece of chalk directly between their eyes.

You were getting up to go home from class when she called to you.

Valentine: "Miss Filia. You stay after with me today."