Strike the Blood Episode 4 English Subbed Episode Title:The Right Arm of the Saint IV.Episode Description:Eustach and Astarte continue their advance to the core of the island’s magical foundations. Kojo regenerates and Yukina offers her blood to him, which results in his gaining mastery over a familiar. They pursue Eustach who reveals that his mission is to retrieve a holy relic which is integral to the foundation of the island. With newfound control over the 5th Familiar - Leo Pemptos - Regulus-Aurum/The Lion of Gold, Kojo and Yukina defeat the intruders.