Ikuto Touhohin just had a fight with his old man, one that led him to make a rash decision to run away from home. He boards a ship, deciding to take a vacation, but the ship is suddenly hit by a huge storm—one that sends Ikuto overboard! When he regains consciousness, he realizes he is still alive on some island. An isolated island. An isolated island with nothing but girls. Beautiful girls. Stranded on an island with only girls, no electricity, gas, radio, television, like he was back in the stone age. (Source: AniDB)

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.

Tsubomi Tachibana is a fifth grader dealing with rather sensitive issues such as her mother's pregnancy, her first period and the strange feelings she has started to get when she has been around boys. (Source: ANN)