We Don't Have Many Friends
Yozora recalls how she recognised Kodaka as her childhood friend, Taka, the moment he transferred in, but he wasn't able to recognise her, which led her to form the Neighbours Club. Yozora to Kodaka that she originally intended to reveal her true gender to him before she moved but was too embarrassed. She also acts to keep the fact they were childhood friends from the rest of the club and just call her by her regular name. Astounded by her new look, Rika gets Yozora to dress up in a boy's uniform as Kodaka contemplates what'll happen from now on.
Aired 23/12/2011EP 12 - We Don't Have Many Friends

Haganai
Hasegawa Kodaka has transferred schools, and he's having a hard time making friends. It doesn't help that his blond hair tends to make people think he's a delinquent. One day, he runs into his bad-tempered solitary classmate Yozora while she's talking animatedly to her imaginary friend Tomo. Realizing that neither of them have any actual friends, they decide that the best way to alter this situation is to form a club and start recruiting.
That is how "Rinjinbu", The Neighbours' Club, was formed, a club specifically designed for people who don't have very many friends. As other lonely classmates slowly join their little club, they'll try to learn how to build friendships through cooking together, playing games, and other group activities. But will this group of relationship-challenged misfits really be able to get along?