I updated Chapter 9 specifically the part where Kakusareta reads the letter by the race representatives to her team.
"Greetings to your team! This letter is to inform you that there will be a tournament that will take place on the abandoned tournamet, used to be used by the humans. We have emergency protocols if an ambush takes place so this event will be safe. This tournament is not only to train your teamwork and skills. It also allows us, the leaders of each races, to choose who will partake in the great war. You can back out if you are not willing to battle, for more details, please talk to Sir Kusaragi. Thank you for your time. Sincerely, the race Leaders."