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:
can’t stop laughing and repeatedly punches a wall. Konatsu becomes affectionate and tries to kiss people. Gokujo Episode 11
attempts to stay sober but is overwhelmed when a drunk and smiling Aya approaches her. Oku serves a drink that is 98% grape
* Soundtracks. Gokujo. Joking? by Youko Hisaka, Maaya Uchida, Ayana Taketatsu and Satomi Akesaka. Opening Theme. Gokujo.: Gokurakuin Joshikou Ryou Monogatari - MyAnimeList Gokujo Episode 11
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?).