At the Border Defense Agency's headquarters, the B-Rank Wars are in progress as each team battles fiercely to earn a place in the upcoming Away Mission. Although Osamu Mikumo and the rest of Tamakoma-2 have survived so far, the final rounds will demand that they push well beyond the limits of their current abilities. After recruiting a talented new member, the squad starts training and devising new strategies, but amidst these efforts, the team is rocked by a heated dispute—one that could jeopardize their ticket to the Neighbor's dimension.