Nemesis-Chan

Summary
Nemesis is a character who attempts to hunt and kill you during Mission Mode. It is impossible to kill her with a frontal attack; if you want to kill her, you need to approach her from behind. If you run, she will hear your footsteps, so you must be very careful and quiet if you wish to sneak up on her. Depending on what difficulty level you have chosen, Nemesis might be invincible, and might also be disguised as one of the female students.

So, just who is Nemesis? Is she a bodyguard hired to protect the student that you're after? Is she a vigilante who has made it her mission to stop you? Is she another assassin who wants to remove her competition? Or, true to her namesake - the Greek goddess of retribution - is she here to take revenge on the protagonist for the sins of her past? For now, it's a complete mystery...