Immortal Hounds volume 4 features story and art by Ryo Yasohachi.

Karigane adpot’s Rin’s risky strategy to rescue Snow White from the UN’s Vector containment facility, but not everything goes according to plan. A colleague starts to worry about Rin and discovers her diary, which includes secrets from her past as well as her current mission. And Shige considers early retirement when tragedy strikes home…