Baka to Test to Shoukanjuu: Matsuri - Sentaku ni Yotte Tenkai ga Kawaru "LIPS Eizou"
Japanese title: バカとテストと召喚獣 ～祭～ 選択によって展開が変わる「LIPS映像」
Alternative titles: Baka to Test to Shoukanjuu: Matsuri Special, Baka to Test to Shoukanjuu OVA Special, The Idiot, the Tests, and the Summoned Creatures OVA Special, Baka and Test: Summon the Beasts OVA Special
Type: ONA
Source: Light novel
Episodes: 1
Status: Finished Airing
Aired: Aug 29, 2010
Duration: 3 min
Rating: PG-13 - Teens 13 or older
Studios: SILVER LINK.
Genres: Comedy
Themes: Parody

A promotional video that was shown to the public at Comiket 78, and uploaded to YouTube and posted on the official website. It was also included with the first Blu-ray/DVD volume of the Matsuri OVA.

It is done in the style of a visual novel game played on a Nintendo DS screen.

(Source: AniDB)

Note: Two other versions of this video are not included in the episode count, as they doesn't feature any new animation.