Episode 13, included in the final volume of the BD/DVD. 
Taking place directly after the events of Chuunibyou demo Koi ga Shitai!, Christmas is coming up and Rikka is told by Nibutani that this is an opportunity for her to get closer to Yuuta. Under Makoto's suggestion, they plan a Christmas party at Sanae's Mansion.

Everybody has had that stage in their life where they have thought themselves to be special, different from the masses of ordinary humans. They might go as far as seeing themselves capable of wielding mystical powers, or maybe even believe themselves to have descended from a fantasy realm. This "disease" is known as "chuunibyou" and is often the source of some of the most embarrassing moments of a person's life.
 
For Yuuta Togashi, the scars that his chuunibyou has left behind are still fresh. Having posed as the "Dark Flame Master" during his middle school years, he looks back at those times with extreme embarrassment, so much so that he decides to attend a high school far away where nobody will recognize him. Putting his dark history behind him, he longs to live a normal high school life.
 
Unfortunately, he hasn't escaped his past yet: enter Rikka Takanashi, Yuuta's new classmate and self-declared vessel of the "Wicked Eye." As this eccentric young girl crashes into Yuuta's life, his dream of an ordinary, chuunibyou-free life quickly crumbles away. In this hilarious and heartwarming story of a boy who just wants to leave his embarrassing memories behind, the delusions of old are far from a thing of the past.
 
(Source: MAL Rewrite)

Due to various events, Yuuta and Rikka are living together. This secret co-habitation is so exciting for the two lovebirds! Or so it should be...
 
Is having a chuuni girlfriend too high of a hurdle for Yuuta, who never even went out with a normal girl?! Yuuta worries about how to advance his relationship with Rikka. And then everyone else, Nibutani, Kumin, and Dekomori, have powered up by advancing a grade. Furthermore, the cause of his chuunibyou outburst in middle school, the girl who calls herself Sophia Ring Saturn the 7th, Satone Shichimiya appears...
 
This is the long-awaited second season of the adolescent romantic comedy revolving around chuunibyou that makes you laugh and cry.
 

(Source: Animax)

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