Clannad

On the way to school one day, Tomoya Okazaki meets a strange girl talking to herself named Nagisa Furukawa. Later in the day, Tomoya has a conversation with Nagisa during lunch and learns that she is repeating her last year of high school, and wants to join the now-disbanded drama club. After school, Tomoya goes to Nagisa's family bakery and meets her parents; he is invited to have dinner with them.

Nagisa admits to wanting to restart the drama club, and Tomoya helps Nagisa to create advertisement posters which they place around school. At school that day, Tomoya meets two other girls: a strange genius named Kotomi Ichinose, and a first-year named Fuko Ibuki. Later that day, Nagisa finds out Tomoya used to play basketball, and invites him to play a game the next day. However, it is later revealed that his father injured Tomoya's arm in a fight; as a result, he is unable to play basketball anymore.

After the previous night's events, Tomoya goes to see if Nagisa is okay, and finds out that she has been physically weak all her life. While walking back from the bakery, Tomoya helps get a strange electrician out of a jam and he gives Tomoya his card, finding his name to be Yusuke Yoshino; Youhei later reveals that Yusuke is a retired professional musician. After school the next day, Tomoya helps Nagisa get more self-confidence for the drama club by acting as a new member of the club asking questions.

Tomoya runs into Fuko again at school, and she tries to invite him to her older sister's upcoming marriage ceremony, but Tomoya is not interested. Tomoya gets Youhei to help reform the drama club by bribing him with bread from Nagisa's family bakery. Nagisa tries to get the help of Ryou and Kyou in reforming the drama club, and Tomoya even tries to ask Tomoyo and Kotomi if they would like to join; Tomoyo is trying to become student council president, and Kotomi does not give an answer. Tomoya and Nagisa later go see Fuko about the club, and he discovers from Nagisa that Fuko is supposedly unconscious in a hospital.

In order to help Fuko out, Tomoya and Nagisa take her to stay at Nagisa's house for the time being. Nagisa's family helps with carving more starfish out of wood, and at school Tomoya and Nagisa help with passing them out to students. Later, Fuko talks about how she has wanted to attend classes, but has never been able to. Tomoya makes arrangements with Youhei, Kyou, and Ryou to act as classmates in Fuko's very first high school class, and even Sanae comes to act as the teacher.

Tomoya and Nagisa invite Fuko's older sister Kouko to the Founder's Festival. In the meantime, Fuko hands out more carved starfish to students at the festival, and her fan club helps spread the word about Kouko's wedding too. Nagisa and Tomoya meet Tomoyo, who is wearing a bear suit to find people who are causing trouble, and manages to knock Youhei out a window for bothering a girl. When Kouko finally comes, she cannot see or hear her sister.

Summer vacation is now over and the second semester has started at Tomoya's school. Nagisa's father Akio asks Tomoya to form a baseball team for a local game against the neighboring shopping district team. Tomoya is able to recruit Kyou and Kotomi from the drama club, Youhei and his younger sister Mei, Tomoyo, Misae, and Yusuke. Tomoya's team manages to get an early lead, but Akio's leg gets injured by a flying bat, and Nagisa fills in for her father as the pitcher. The other team catches up near the end, and it comes down to the final inning when Tomoya scores an RBI, winning the game.

Mei has become worried about her older brother since he still does not have a plan after high school, and comes to stay at Nagisa's for the time being. Based on a fleeting comment by Youhei, Tomoya gets the idea to ask a girl to pose as his girlfriend so Mei will stop worrying about him. Youhei goes around with Tomoya and Nagisa asking Ryou, Tomoyo, Kotomi, and Yukine, but no one can help him. Sanae overhears Youhei's trouble and decides to be his fake girlfriend if it will help push him in the right direction in life. Youhei, however, still believes her to be Nagisa's older sister. When Mei meets her brother's "girlfriend", Sanae is posing as a student from Tomoya's high school.

Yohei and Sanae go out on a date, accompanied by Mei, Tomoya and Nagisa. During the date the group witnesses a young girl being bullied by some slightly older boys. The scene is resolved by the girls older brother rushing in to help his sister. Mei remembers how Yohei used to be like that, but once he joined the football club he didn't seem to care about her any more. The group then tries to provoke a brotherly response from Yohei, to get him to stand up for his sister; Tomoya pretends to be romantically interested in Mei, but despite being shocked, Yohei doesn't say anything to oppose them. Mei decides to stay a little while longer, as she can't leave things the way that they are.

Youhei has not been coming to class lately, and his friends and Mei are worrying about his situation. Mei, Tomoya, and Nagisa visit the soccer club, and try to convince them to let Youhei rejoin. After a grueling task of fetching soccer balls, the club still will not let Youhei back on the team. While the leader of the soccer team makes Mei cry and picks on her, Youhei storms in and starts beating up the entire soccer club with the help of Tomoya. After the soccer team members leave, Tomoya and Youhei have another fight about the protection of Mei. Youhei finally admits he was worried about Mei, and the fight is resolved after Mei and Nagisa interject. Tomoya later recounts to himself how he and Youhei first met.

Tomoya and Nagisa visit Youhei, and spend some time talking with Misae and Tomoyo who comes over after them. Later, when Tomoya and Nagisa are talking with Misae privately, Tomoya starts falling asleep. It is shown how when Misae was a first-year in high school, she met a strange boy named Katsuki Shima who says he can grant her one wish in return for her cheering him up years before when he was in the hospital. Misae has a boy she likes named Igarashi, but who unknown to her already has a girlfriend. Igarashi asks Katsuki to tell her this, but he cannot tell her directly and starts crying. Misae sees Igarashi with his girlfriend, and realizes the truth; she runs away, leaving Katsuki behind.

After getting over Igarashi, Misae starts hanging out with Katsuki more and starts falling in love with him. One day, Katsuki realizes after going to his house with two of Misae's friends that he is in fact not Katsuki Shima, but a cat who was sent by the dying Katsuki Shima to grant Misae's wish. At the autumn festival, Misae confesses she has come to love Katsuki, but that night he disappears shortly after Misae made her wish for him to always be with her. After Tomoya wakes up, and realizes the cat showed him all this, Tomoya later tells Misae some things Katsuki did not get a chance to tell her.