After being sent to Tokyo, the Aragami-target Momoji discovers that she is now under the care of the TAC. She knows these monsters are terrible, evil things, and really wants to help, but can't find out how to.

The TAC soon discover that their base isn't as safe as they thought when an Aragami breaks in and attacks.

Angered Momiji sets out to rescue a kidnapped little girl. Unfortunately, the girls father is a man who studied Kaede (Momiji's sister), and the kidnapper is asking for extra material.. Material that can help the Aragami defend themselves from Momiji.