At the Border Defense Agency's main hub, the B-Rank Wars are raging as teams vie for a chance at the upcoming Away Mission. Osamu Mikumo and his Tamakoma-2 comrades have managed to hold their ground, but the concluding rounds demand a leap beyond their known capabilities. Welcoming a skilled recruit, the group dives into rigorous training and tactical innovations. Yet, amidst their preparations, internal tensions rise, threatening their crucial passage to the Neighbor's realm.