I just looked for the synopses myself...
Hyakko - "On the first day of high school at Kamizono Academy, four girls meet each other while lost on the huge campus, and form a friendship. This story follows the daily school life of the four girls and their eclectic classmates." "As the plot progresses, Torako and her friends gradually begin to learn and interact with their classmates in Class 1-6, in which each student has unique and extraordinary personality." 13 Episodes.
Wikipedia &
ANN
Junjou Romantica - An all male cast in a show that has a romantic theme. You do the math.
Wikipedia &
ANN
Rideback - "Set in Japan in 2020, it follows the story of female student Rin Ogata as she comes across a two-wheeled automobile robot known as a Rideback". 12 Episodes.
Wikipedia &
ANN
Valkyria Chronicles - Set in fictional Europe in 1935: "When Imperial forces attack the small border town of Bruhl, Welkin Gunther, son of late General Belgen Gunther, is forced to fight for his life alongside Town Watch captain Alicia Melchiott. Along with Welkin's adopted sister Isara, the three escape to Gallia's capitol and subsequently join the country's militia forces. As members of the newly-formed Squad 7, they must work to repel the invading Imperial forces and discover the true purpose of the invasion itself." 13 Episodes.
Wikipedia &
ANN
Zoku Sayonara Zetsubou Sensei - Second series of Sayonara Zetsubou Sensei: "More crazy antics abound as Nozomu Itoshiki, a.k.a Zetsubo-sensei, who is the worlds most negative person, tries to teach class 2-H about how life is filled with despair and darkness. A harder task than it first may seem, with his students being far from ordinary themselves, including the likes of the most positive girl he has ever met, his very own stalker, a foreign exchange student with split personalities and a perfectionist acting class president, due to the fact the real class president can't be seen by anyone, among others.". 13 Episodes.
Wikipedia &
ANN
Natsume Yuujinchou - "Natsume Takashi has the ability to see spirits, which he has long kept secret. However, once he inherits a strange book that belonged to his deceased grandmother, Reiko, he discovers the reason why spirits surround him. Containing the names of these spirits, a binding contract was formed between the spirits and the owner of the book. Now, Natsume is determined to free the spirits and dissolve the contracts. With the help of a spirit cat, his days are filled trying to return the names to these spirits." 13 Episodes.
Wikipedia &
ANN
Everyone get your votes in, if you haven't already...