"Earth is under constant threat from Neighbors, invincible monsters from another dimension that destroy our way of life. At least we have the elite warriors of Border, who co-opt alien technology to fight back! Our hero Osamu Mikumo may not be the best agent, but along with his Neighbor friend Yuma, he'll do whatever it takes to defend life on Earth as we know it. Border is abuzz with gossip about Tamakoma's New Recruits; Osamu and Yuma attract so much attention that top A-Rank Agents challenge them to duels! Does Osamu have what it takes to stand in the spotlight?"--Page 4 of cover.