Asami Onohara is a seventeen-year old high-school student with a secret which has not been revealed to anyone: She is already married. Her husband, Kyosuke Ichimaru, is a Physics teacher in the same high school as her. However, even though they are officially a married couple, Asami's father forbids them to have any sexual contact until after Asami has graduated. Asami has to hide the fact that she is married to Kyosuke while trying desperately to further their relationship, and it does not help when there are so many interferences and obstacles from her father and other third parties. (Source: ANN)

In the peaceful little town of Sakuranomori, a group of young friends are about to bid farewell to one of their own. Due to his parents’ business plans, Sana Hidaka has to move away from his quiet childhood home to the boisterous city of Tokyo. Though it pains him, he must say goodbye to his precious friends—the kind-hearted Aoi Oribe, the spunky Wakatsuki twins, Shuri and Shuusuke, and the cheerful and upbeat Nanaka Yatsushiro. But even though he is reluctant to leave them behind, he believes that no matter how far apart they are, they will always cherish the memories of their friendship. Five years later, Sana, now a 16-year-old high school student, returns to his hometown with the hope of restoring his old life. However, he quickly realizes that although his town may not have changed drastically, the friends he left behind are not who they used to be. Unsettling shadows loom over Sakuranomori as his friends hold new secrets and bear burdens that threaten the bonds they once shared.

Miyo Sasaki is an energetic high school girl who comes from a broken family consisting of her unconfident father and an overly invested stepmother, whose attempts at connecting with Miyo come across as bothersome. Seeing Kento Hinode as a refuge from all her personal issues, she cannot help herself from forcing her unorthodox demonstrations of love onto her crush. While Miyo is unable to get Kento's attention as herself, she manages to succeed by interacting with him in the form of a white cat, affectionately nicknamed Tarou by Kento. But Miyo soon realizes that she cannot help Kento with the various problems she overhears in her cat form and is now caught between two tough choices. Will she continue her relationship with him as a cat, or will she reveal her identity and risk what they have in order to help him as her human self?

In a familiar yet different universe, shy bookworm and gamer Yuki Nagato is the president of North High School's Literary Club. Her friends, the overly-cautious Ryouko Asakura and completely average Kyon, are the only other members of the club. Nevertheless, Yuki enjoys the peace and quiet she shares with them, especially when she is with Kyon, whom she has a crush on. Added to the mix are Tsuruya and Mikuru Asahina, two friends with opposite personalities who frequently stop by the Literary Club. While walking back to her apartment on a cold December day, Yuki is coerced into drawing strange symbols on the ground by a girl supposedly attempting to capture Santa Claus. The girl introduces herself as Haruhi Suzumiya, an eccentric student from the prestigious Kouyouen Academy who is on the hunt for aliens, time travelers, and espers. When Haruhi and her friend Itsuki Koizumi make a sudden appearance in the clubroom, they declare themselves as official members of the Literary Club, with Haruhi taking up residence as the executive president. With the tranquil days of the Literary Club now behind them, Yuki and her friends get caught up in a series of misadventures under Haruhi's leadership—with each incident bringing Yuki and Kyon closer than ever before.