Baka to Test to Shoukanjuu: Matsuri - Sentaku ni Yotte Tenkai ga Kawaru "LIPS Eizou"
Genres: Comedy
Type: ONA, Episodes: 1
Aired: Aug 29, 2010
Studio: SILVER LINK.
Source: Light novel
Rating: PG-13 - Teens 13 or older
Synopsis:
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)