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Baka to Test to Shoukanjuu: Matsuri - Sentaku ni Yotte Tenkai ga Kawaru "LIPS Eizou"
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」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)