Strike the Blood: Valkyria no Oukoku-hen

Kojou and Yukina are on their way to school as usual when they find La Folia being chased by someone. Yukina crosses blades with the enormous man who's pursuing her, but before the fight can escalate further, La Folia makes a shocking comment: "Father, this is the Fourth Progenitor, Akatsuki Kojou my first!" La Folia's father, Lucas, had told her to decide who she wished to marry, so she declares that Kojou is her choice. Lucas refuses to accept this, but then La Folia's mother, Polifonia, invites Kojou and Yukina to a party so they can all talk in more detail. When they arrive at the party, they discover that Asagi, Yaze, Nagisa, and Sayaka have been invited as well, due to their connections with Kojou. What sort of heated battle is about to break out between the many girls in Kojou's life?!(Source: Crunchyroll)

Strike the Blood: Valkyria no Oukoku-hen

Strike the Blood (TV Series 2013–2022) - Episode list - IMDb

Strike the Blood S5 EP 01 Sub Indo - BiliBili

Strike the Blood: Valkyria no Oukoku-hen – OVA – 01, 02 – Random Curiosity

Strike the Blood: Kingdom of the Valkyria

Strike the Blood: Valkyria no Oukoku-hen – OVA – 01, 02 – Random Curiosity

Strike the Blood: Valkyria no Oukoku-hen – OVA – 01, 02 – Random Curiosity

Trine Halden, Legends of the Multi Universe Wiki

Strike the Blood: Valkyria no Oukoku-hen - Characters & Staff

Strike The Blood: I Valkyria No Oukoku-Hen [EP 1] OVA - BiliBili

Present Yukina Asagi Nagisa (Strike the blood Valkyria no Oukoku hen Poster ) : r/StrikeTB

La Folia and Yukina kidnapped by Movi-Viento on DeviantArt

Harunatsu Fansubs on X: Strike the Blood OVA – Valkyria no Oukoku-hen / X