Kingdom of the Valkyria I (ヴァルキュリアの王国 前篇 Varukyuria no Ōkoku Zenpen) is the first episode of the Strike the Blood OVA, and the twenty-fifth episode overall.
- Kojou & Yukina meet with La Folia's family, who invited them to their party.
- Trine Halden assaults the party with a demonic insect swarm and traps Kojou under her control.
- Kojou enters the girl's bath.
- Finally reviled that Kojou is under mind-control. LaFolia and and Yukina are kidnapped by Dimitre Valter
- large demonic insect swarm.