Kanon (2006)

As a young child, Aizawa Yuuichi had often visited his cousin in the city. However, something drastic happened to keep him away for seven long years. Now, Yuuichi returns, his memories of those days are simply gone. Settling into the wintry town, Yuuichi comes across several young girls, all of whom are connected to his past. As he befriends them and continues to interact with them, the long forgotten memories from his childhood begin to resurface...

Kakyuusei (TV)

When Tsuyoshi rushed to school as usual, he found a girl who tried to help a kitten which couldn't get down from a tree. It was Minamizato Ai who had loved Tsuyoshi secretly for a long time.

Clannad

Tomoya is a bitter, third year high school student. His mother passed away, causing his father to resort to alcohol and gambling. Tomoya is distant with his father and has become a delinquent in the years since his mother's death. Walking to school, he meets Nagisa Furukawa who is a year older but is repeating the grade due to illness. She is alone, as most of her friends have moved on. The two begin hanging out, and as time goes by, Tomoya finds his life shifting in a new direction. (Source: Sentai Filmworks)

Kanon

Changing schools is something Yuuchi is accustomed to, due to his parent's profession, and with their recent venture to Africa, he is returning to his aunt's home after 7 years. The time that has passed since his last visit has faded his memories of the people he knew, and the ties that bonded them to him, including his cousin Nayuki. Slowly those people, coincidently all being girls, find their way back to him. However, time has passed and things have happened in their own lives that sets the tone for the series. Secrets that are coming to surface, and memories that are returning to not only Yuuichi, but to those surrounding him. A very heartwarming tale that touches upon a spectrum of emotions, mystery, and the supernatural. (Source: Anime News Network)

D.C.II: Da Capo II

The undying Sakura Trees return. Based on a PS2 sequel of the original DaCapo game, the story once again takes place on Hatsunejima, but is set 53 years after the events of D.C. and D.C.S.S.. Although some characters will probably look a bit familiar to the initiated eye, the cast is a new one. The new main protagonist is Yoshiyuki Sakurai, who lives next door to the Asakura sisters Yume and Otome, who are the granddaughters of Junichi and Nemu from the first season.