Kanon is the story of Yuuichi Aizawa and his return to his always snowy hometown after eight years. The problem is that Yuuichi doesn’t remember his time there and all the people he met, so he has to gradually begin to remember everything. Of course this being a love story Yuuichi meets several girls including his cousin Naiyuki, the taiyaki obsessed Ayu, the silent Mai, the cute yet aggresive Makoto, and the terminally ill Shiori.
Taken from: http://otakuism.animeblogger.net/?p=321
Kanon has finished publishing and it has 6 Chapters. It is also Known as: Kanon
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2. Air
Yukito Kunisaki is a man traveling Japan in search of the "girl in the sky". Eventually he makes his way to a sleepy seaside town where he meets a strange girl named Misuzu Kamio who has dreams of flying in the sky. During his stay in the town, Yukito meets other unique people and begins to learn more about Misuzu and the town she lives in.
Air has finished publishing and it has 18 Chapters. It is also Known as: AIR, Air
1. Clannad
Okazaki Tomoya is a delinquent who finds life dull and believes he'll never amount to anything. Along with his friend Sunohara, he skips school and plans to waste his high school days away.
One day while walking to school, Tomoya passes a young girl muttering quietly to herself. Without warning she exclaims "Anpan!" (a popular Japanese food) which catches Tomoya's attention. He soon discovers the girl's name is Furukawa Nagisa and that she exclaims things she likes in order to motivate herself. Nagisa claims they are now friends, but Tomoya walks away passing the encounter off as nothing.
However, Tomoya finds he is noticing Nagisa more and more around school. Eventually he concedes and befriends her. Tomoya learns Nagisa has been held back a year due to a severe illness and that her dream is to revive the school's drama club. Claiming he has nothing better to do, he decides to help her achieve this goal along with the help of four other girls.
As Tomoya spends more time with the girls, he learns more about them and their problems. As he attempts to help each girl overcome her respective obstacle, he begins to realise life isn't as dull as he once thought.
Clannad has finished publishing and it has 45 Chapters. It is also Known as: クラナド, CLANNAD Original Comic, For You Not