|Promises That Come Back are a Battlefield (Episode)|
|Romaji||Yomigaeru Yakusoku wa Shuraba|
|Air date||March 3, 2013|
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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.