An animated film adaptation of the Kuroko no Basket: Extra Game manga.
An American street basketball team called Jabberwock comes to Japan and plays a friendly match with a Japanese team, but after the Japanese team suffers a crushing defeat, the team members of Jabberwock start mocking Japanese basketball. Their comments enrage Riko's father, and so he gathers a team made up of the five members of the Generation of Miracles plus Kuroko and Kagami, called Vorpal Swords, to have a revenge match against Jabberwock.

(Source: Anime News Network)