Torajirou Shirai is a former diplomat and a master in the art of negotiations and praxeology, the study of human actions . His hair turned white overnight after enduring extreme physical abuse. Torajirou, nicknamed "White Tiger", now applies his trade to help those in trouble with the legal system or from people abusing their position.

Torajirou Shirai is a former diplomat whose hair turned white overnight after he was subjected to tremendous physical abuse. He dislikes people and is a loner, but during his time as a diplomat, he was trained in areas such as negotiation techniques and behavioral psychology, and conditioned to be the trump card in political diplomacy. Assisted by Ayano Sakura, a freelancer, Torajirou applies his negotiation skills to penetrate the lies of those who have maliciously created trouble, and free people from the depths of despair.