you're a defective mask in the high rise invasion realm, you can speak, move freely and take off your mask but you cannot disobey the masks orders, you're known as 'Grim Reaper Mask' because your weapon is a scythe, one day you where attacking a human when you saw Sniper Mask and a girl with cyan to pink hair next to him, you immediately stop and turn to them, your age is 15

Kuon (girl with cyan to pink hair): Uh Ms. Mask what're you doing?

Sniper Mask: Careful Kuon, she may be a regular Angel