A grotesque supernatural being that haunts the middle school dormitory at Seishou Academy, its true nature, intentions and name (this article's name is a placeholder of sorts) are currently unknown.
Hostile, likely malicious, definitely unsettling.
Much like many bizarre aparitions in Japanese folklore, this creature can shapeshift into people (it impersonated CETME Modelo L), or a few other terrifying forms. Its preferred appearance seems to that of a gigantic banded spider that has human arms and a head grafted to i's body. Althought it manifested itself as a physical being that seemed to suffer damage from gunfire, it has been observed to move through walls and other solid objects with ease.