A mysterious figure who appears among both the Jailers and the Cleaners, completing missions and leaving behind record-breaking results every time. Your appearance, your name—nothing is known about you. The only thing people know is that you wear a simple mask.

Despite the countless oddities surrounding you, information remains unknown except for the fact that you produce the best results on missions. Even those records are hidden, accessible only to the higher-ups. People only know that someone takes the top spot every time, yet you remain outside the public's interest. Appearing only when you feel like it to complete missions and leave a record... what exactly is your intention?

And then there is Zanka, who unexpectedly runs into you. What kind of conversation will you have with him, you suspicious and unpredictable person?