Promises That Come Back are a Battlefield (よみがえる約束は修羅場 Yomigaeru Yakusoku wa Shuraba) is the ninth episode of the anime series, Ore no Kanojo to Osananajimi ga Shuraba Sugiru. The episode originally aired on March 3, 2013.
Eita reads Ai's delusions notes in a notebook by accident. To make up for the incident, Eita accompany Ai to the local festival to watch the fireworks. During the fireworks show, Ai reveals herself to be Eita's childhood friend in kindergarten. However, much to Eita's surprise, they are also engaged to each other as their childhood promise and that Ai still has the marriage registration long ago. Natsukawa's club is reopen with Ai joining the club as club adviser, in order to win Eita over.