Nearly the entire school is unwittingly turned into zombies.

Murasawa pushes Tomoko and hits another student.

Sayaka pushes Aki into the pool.

Murasawa is stabbed repeatedly. His body is later found by a student. (graphic)

A math teacher goes on a rampage cutting off his student's heads and arms. (graphic)

Two different zombie students bites other students. (graphic)

A zombie starts eating a arm. (mildly graphic)

Mariko stabs and tortures another teacher. She later stabs him in the head. (graphic)

One zombie student vomits up blood and what looks like an eyeball (or possibly a cherry).

A fight between Aki and two zombies. She slits one of the zombie's throats and breaks the other's neck. (graphic)

A ruler / baseball bat fight between Aki and the math teacher.

In a flashback Crazy Doctor tortures Aki.

Aki hits Mariko with a pipe.

Mariko attacks a student with a chainsaw. (graphic)

A sword fight (of sorts) between Mariko and the swim team. (mildly graphic)

An explosion.

A fight between Aki and Crazy Doctor. (mildly graphic)

Crazy Doctor sexually assaults Aki. (Aki is shown topless and later fully nude - from the side).