S2OVA1 Forbidden All-Hard!

Forbidden All Hard! (禁断のオールハード！ Kindan no Ooru Haado!) is an Original Video Animation (OVA) included as extra material when Free!-Eternal Summer- was released on March 18, 2015.

Synopsis
The Iwatobi High School Swim Club visits the Samezuka Academy Cultural Festival, enjoys the festivities and later engages with the Samezuka Swimming Club in a water survival game.

Story
The Iwatobi swim club members are seen admiring the booths at Samezuka's annual cultural festival. Accidentally, Haruka Nanase bumps into a pretty young woman dressed in a traditional maid's outfit who actually turns out to be Aiichiro Nitori. Aiichiro explains that their swim club usually runs the "Maid Café from Hell." When greeted at the café, the boys runs into Momotaro Mikoshiba, also dressed like a maid who bewails the fact that Gou Matsuoka might see him dressed so. Rin Matsuoka is also present, dressed as a butler and Sosuke Yamazaki is behind the scenes preparing the food being served. Rin informs Haru and the others that he, Momo, Nitori and Sosuke are going to go on break, so they can wander the festival with them.

Later, the group comes across a stall advertising water fight competitions, which catches Haruka's attention for multiple reasons, one of which is that some of the kanji used on the sign could be read as "mackerel." The group splits into two teams: Red (consisting of Rin, Makoto Tachibana, Aiichiro and Rei Ryugazaki; and Blue (consisting of Haruka, Sosuke, Nagisa Hazuki and Momotaro). The ensuing battle takes many dramatic turns with several shock confrontations, traps, and a few unfortunate encounters (e.g. Kisumi Shigino getting wet because he shows up in the midst of the event).

Ultimately, things ends in a showdown at sunset between Rin and Haruka which results in a win for Team Red thanks to Haruka's willingness to get soaked. Following the fight, the group gathers around the bonfires at the festival's conclusion where they all dry off and have an animated and long discussion, including the prospect of the Samezuka team attending the Iwatobi High School cultural festival in the future.

Characters
List of characters in order of appearance: