Kinji Tohyama just wants a normal, quiet life, but Aria H. Kanzaki, Tokyo Butei High’s gun-toting, sword-wielding, pigtailed super-detective, has declared him her partner. He agrees to join her on a single case, no matter how big or small. It turns out to be far bigger than either of them expected. As the mission pulls them into a dangerous conspiracy, Kinji and Aria are forced to face their own troubled pasts and the painful reasons behind the paths they’ve chosen. In Volume 2, action, mystery, comedy, and heartfelt drama collide, and the bond between this mismatched pair is tested.