When they hear an emergency signal , Arata and Touka decide to head into the forest , and Kotarou runs after them .
Esaka tells Kotarou that Guardian is searching for the Key , and Kotarou is to monitor the city with Touka and Arata by posing as civilians .
When Guardian hear an emergency signal , Arata and Touka decide to head into the forest , and Kotarou runs after Guardian .
Esaka tells Kotarou that Guardian is searching for the Key , and Kotarou is to monitor the city with Touka and Arata by posing as civilians .