If you liked the Boku wa Tomodachi ga Sukunai anime, the Anime-Planet community thinks you'd like:
Once a popular all girls' school, Ousai Private Academy is now co-ed due to declining birth rates. Takatoshi Tsuda, a boy newly attending Ousai solely because of the proximity to his house, is quickly forced to become the student council vice president and male representative of the school by president Shino Amakusa. Now looked upon as nothing more than a filthy pig by his female peers, Takatoshi must cope with learning about a whole new side of the opposite gender, hearing plenty of dirty sex and period jokes along the way!
In both, a guy in forced to join a school group. He is then surrounded by girls, some vulgar and some fairly nomal, but he ends up pretty much being the only sane character. The both use similar, preverted humor.
Years ago, Saku moved away from his hometown, leaving behind his friend and tormentor Mihoshi. As a child, Mihoshi constantly forced the bookish and shy Saku to play and look at the stars; and now, as Saku moves back home to attend high school, he prays for a quiet school life free from her grasp. Unfortunately, Saku’s desires are quickly shattered as Mihoshi catches sight of him and convinces him to join the school’s astronomy club. Alongside Mihoshi, the other club members and Hime - another girl from Saku’s past who’s determined to win him over - Saku continues his dreadfully unordinary high school life with a grimace and positive attitude!
Both of these shows are comedies about a high school club and its interesting members. Most of the shows revolve around club activities, trips, and some minor character development. If you enjoyed one you might enjoy the other.
Ever since their first meeting at six years old, Hikari Hanazono has struggled to defeat her rival Kei Takashima at anything, whether it be athletics or academics. To date she has proven unsuccessful, resulting in Kei constantly referring to her as "second place." In reality, Kei has been in love with Hikari for quite some time, but Hikari remains completely oblivious to the fact. Now, as the top two students in a prestigious academy, the duo continues their long-running competition as part of the school's elite class of seven, the Special A. Will Hikari ever surpass Kei... or realize that he loves her?
Special A features a club of elite academic students, and Tomodachi features a club of students who don't have any friends. Both anime focus on the inter-relations between the club members, and the fun activities these members share together. Get to know the club members and share in their slice-of-life moments of comedy and light romance.
Yura Yamato arrives for her first day at her dream school, the Stella Women’s Academy, eager to have a wondrous experience. But the teen’s fairy-tale dreams are soon dashed by a rather jarring recruitment into the C3 club - a group of girls who love nothing more than to play survival and war games on campus with Airsoft and BB guns! How will the typical Yura navigate her way through a club whose name stands for Command, Control and Communication, when all shes wants is to have a normal high school life?
Two indidviduals step into high school, hoping to have happy or at least normal high school lives but they recieve everything but. The MC in both series end up getting dragged into clubs filled with moderately to overly strange people. Both series are comedic and just down right fun to watch. C3-Bu is much more moe than Haganai but if you liked one series, you'll probably like the other.