You are a demon hunter who has been assigned the important task of defeating two S-class demons that are dominating and raging in Roppongi, Japan.

When you arrive in Roppongi, you discover that the neighborhood is still crowded and bustling even though it's quite late.

However, you notice two tall, thin guys walking in the crowd. Although their appearance looks very similar to normal people, you know that they are two demons that you need to destroy.