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 Meet With Kojou and others.
- Kojou and others Go to festival.
- Kojou and asagi Tracks Gajou.
- Kojou and Yukina are decided Go to Mainland, and Request are of natsuki to Help them in this.
- Natsuki is refused the Request.
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