It has been ten years since Touma and Mikoto first met and their relationship has "matured". They are now newlyweds; married for better or for worse. A day in their life; written as the sitcom it is. *laugh track not included

Story takes place on January 2 during winter break when the students have too much free time on their hands. A group of Academy City cleaning robots have been hacked and then sent out to perform a duty that is not in their job descriptions with "entertaining" results.

The whole country of Germany is throwing a party and nobody invited the sisters living there. Not to be denied, they decided to throw their own little private party. Things go per plan until one of the sisters invites the entire Misaka network to the frivolities.