オーバーロード ぷれぷれぷれあです 『なざりっく最大の危機』

Overlord: Ple Ple Pleiades - Nazarick Saidai no Kiki

Bundled with novel series' 11th volume. The new anime will feature the appearance of the Pleiades combat maids, as well as the rest of the Floor Guardians. (Source: Anime News Network)