The fourth special episode of the third season of , titled BorN , is a short, comedic OVA focused on Serafall Leviathan and her sister, Sona Sitri . Plot Summary

: After Sona tries it on, she discovers she cannot remove the costume unless she performs a specific, embarrassing magical girl transformation sequence.

Some versions or listings for "Special 4" in the High School DxD franchise also highlight:

Be careful not to confuse this with the fourth episode of the main BorN season (Season 3), which features a serious battle against the Norse god and the wolf Fenrir . You can find more details on these episodes on the High School DxD Wiki . Episode 4 (Season 3, BorN) | High School DxD Wiki | Fandom

: To help her decide, she convinces a reluctant Sona to model the blue outfit.

: Issei practices his technique on schoolmates and eventually on Rias and Akeno back in the clubroom to test its effectiveness. Note on Episode Numbering