Kei X Yaku: Bound By Law manga volume 4 features story and art by Yoshie Kaoruhara.

The truth of the Joker case is finally laid bare, and a daring rescue reunites brother and sister after three long years. New revelations shine a light on an even graver incident never truly put to rest: the explosion of the Tetra building 20 years ago. Haunted by the event that shaped the man he has become, Ichiro must either learn to accept help when pursuing the thread of his past, or risk going down a path of no return…