Now that Miharu has joined the Grey Wolves, he's already been given his first mission. The Koga have asked for Grey Wolf students to join them in a meaningful discussion about the future of the Nabari Hidden World. The Grey Wolves see it as an opportunity to try to get the Koga's forbidden art scroll, Daya. They are told that it's actually a drug not a technique - a cure-all that could potentially stop Kira from killing Yoite or remove the secret art from Miharu's body. On their way to the mission, Raikou's lands Yukimi's car in the river and a Koga shinobi, comes to take them to Alya Academy. On arrival they find out that the Koga shinobi are in conflict. The student council and the headmaster have learned that two students have died and they don't believe the teachers who say the deaths were accidents. They also learn that the Banten shinobi have been invited. When Thobari and Kouichi learn that Miharu has joined the Grey Wolves, they decide to ask him why and, if he's really turned against them, they are determined not to forgive him. Before they can talk any more, the guestsi are all attacked by Koga ninja.....