The 4th Primogenitor on the run I (逃亡の第四真祖篇Ⅰ Tōbō no Dai yon Shinso-hen Ⅰ) is the fourth episode of Strike the Blood II, and the thirtieth episode overall.
- Gajou is appeared and met With Kojou and others.
- Kojou and others go to festival.
- Kojou and asagi track Gajou.
- Kojou and Yukina are decide to go to Mainland, and request natsuki to Help them in this.
- Natsuki is refuses the Request.