A few minutes before lunchtime, the snack booth area in the schoolyard was filled with visitors who wanted to buy food. Two people in the crowd wore black robes and covered their faces with spooky masks.
The two didn't look suspicious as they weren't the only ones wearing weird costumes at the cultural festival. One was wearing a purple colored mask, and the other was blood-red. They are members of the terrorist organization that has recently been wreaking havoc in Japan, The Ghost Nebula.
The person wearing the purple mask has the position of Colonel in the organization, and his code name is Sigma, while the one wearing the blood-red mask is a Major with the code name Omicron. The two came to Suisei High School to carry out a mission from the Ghost Nebula.
Sigma and Omicron suddenly separated from the crowd and walked to a quiet area of the school grounds. They checked the surroundings to ensure no one other than them was there.