Episode 11 | Gokujo

Ai is the only one who remains sober. She attempts to rescue Aya from Minami by crawling through an air vent, with Utsunomiya following closely behind.

Episode 11 of the anime (full title: Gokujo.: Gokurakuin Joshikou Ryou Monogatari ) is titled "Crazy Masquerade?" (Japanese: クレイジーマスカレード?). Gokujo Episode 11

Oku serves a drink that is 98% grape juice, but it somehow causes the majority of the students to act completely drunk. Chaos and Confusion: The drunk characters behave wildly: Ai is the only one who remains sober