ข้อมูลอนิเมะLittle Busters!

Awakened early in the morning by someone announcing the return of Kyousuke Natsume, Riki Naoe goes to stop his roommate Masato Inohara from fighting their friend and Masato's rival Kengo Miyazawa. Riki asks Kyousuke to intercede, who tells them to fight only with objects thrown from the crowd of onlookers. Kyousuke's younger sister Rin objects when Masato tries to use a white cat as his weapon, causing Kengo to lose interest. Riki reminisces how he has been friends with Kyousuke, Masato, Kengo and Rin since childhood when they brought him into their group called the Little Busters. Riki later suggests that the five of them do something together like they used to, and Kyousuke proposes that they play baseball under the team name Little Busters. Kengo immediately excuses himself from this, as he has to prepare for a kendo tournament. Later that night, Kyousuke gets Rin to go to the girl's dormitory to try to recruit team members. After a couple of failed attempts, Rin is confronted by Sasami Sasasegawa and three other members of the softball team; Rin ends up losing the fight. The next day, Riki goes looking for new Little Busters members, which leads him to follow a girl up to the school's roof.

On the school's roof, Riki finds Komari Kamikita, a clumsy girl from his class who loves sweets. Riki tells her he wants to recruit her for the baseball team, but he soon realizes that she may not be well suited for baseball. Later, Riki goes to find Rin after she shirks her classroom duties to play with several cats. One of the cats has two notes tied to it, the first of which says that there is a secret to the world and if they want to find out what it is, they have to complete several tasks first. The second note lists their first task: Fix the sanitation problem in the boys' dorm storage shack. Riki doubts the sincerity of the notes, but Rin is excited to take on the first task. She later gathers up Kyousuke, Riki and Masato to go clean the storage shack. Komari finds them there and agrees to be join their baseball team, but first she and the others go to work cleaning up the shack. On the baseball field, Komari displays a complete lack of athletic ability, but Kyousuke still welcomes her onto the team after she replies to his question of what is necessary for baseball with the answer, "Guts, bravery and friendship." Soon after, Riki collapses from an attack of narcolepsy, which he has had since childhood.

The members of the Little Busters baseball team have morning practice, though Rin is less than enthusiastic. Masato gives Riki back his idiom dictionary, albeit damaged and smelly, in a plastic bag. Haruka Saigusa, a girl from a different class, wantonly borrows the dictionary before Riki can stop her, and upon chasing after her accidentally runs into the desk of Yuiko Kurugaya, a genius girl who is often absent from class. While during a class break when Riki is trying to buy a drink from a vending machine, Yuiko drags him away to a spot with a few chairs and a wooden box she set up among some hedges. They spend time talking, and ultimately Riki loses track of time, later dashing back to class when he hears the bell. Haruka gives Riki back the dictionary and berates him over its disgusting state under the cover. When Masato and Kengo are about to have another fight, Yuiko intervenes, causing Kengo to lose interest. Yuiko and Masato initially fight with the rules Kyousuke previously set up, but Yuiko loses after she severely kicks Masato several times. Later, Yuiko catches the Little Busters during practice and joins the team, proving to be a powerful asset.

Riki helps his classmate Kudryavka Noumi move her boxes into her new dorm room one afternoon. The next day, Riki goes to the roof looking for Komari to thank her in place of Rin for taking care of one her cats that was injured. He finds her asleep and hears her sleep-talk about her brother, but when Riki asks Komari about him, she says she is an only child and that her brother only appears in her dreams to read her a picture book with eggs and chicks. The next day, Riki and Rin go to the roof and find Komari a little sad. She had found the picture book from her dreams with the name Takuya Kamikita on the back, but her mother will not tell her anything about having a brother, and Komari cannot remember anything about him. Komari asks Riki and Rin to accompany her to a retirement home, and the other members of the Little Busters decide to join in as well. They spend time with the retirees, talking with them and cleaning their rooms. Riki cleans the room of a cross old man named Kojirō who normally scares anyone away by yelling at them, but Riki stays and cleans his room regardless. After he scares away Komari, Kojirō reveals his full name to be Kojirō Kamikita and tells Riki to keep her away from him.

Komari continues to dream about her brother, and Riki goes to see Kojirō to learn more about Takuya. Kojirō merely tells him that he should not pry further into the matter if he cares about Komari. Unable to sleep, Riki goes out to buy a drink and encounters Komari at the school gate, who had gone out to buy snacks. She invites him up to the roof to watch a meteor shower, where the spend the rest of the night. Komari asks Riki to go on a date with her so she can search for her lost memories. They take a train to go to where Komari used to live and they end up taking a boat out on a lake. Riki suggests to her that she does not necessarily have to look for her brother, and Komari jokingly asks him if he will be her brother. It starts raining on their way back towards school, and while running to find shelter, Riki spots a dead kitten. Komari starts sobbing uncontrollably as she recalls memories of her brother.

Komari is in shock from remembering her dead brother Takuya, recalling the time they spent together in the hospital. In Komari's recollection, Takuya writes a picture book for her, and tells her that he might be gone when she wakes, but tells her not to be sad because it will all be a dream. When Komari awakens, her brother has died, but she remembers what he said, and does not despair. As a defense mechanism, Komari begins to believe that Riki is her brother. Kyousuke tells Riki that if anybody can save Komari, Riki can. Riki speaks with Kojirō, who tells him that this happens every time Komari witnesses death, and that she will return to normal in a few weeks. However, Riki is determined to save Komari, and adds to Takuya's story book. Riki forces Komari to accept her brother's death, but through his extension of Takuya's book, shows Komari that she has friends to support her.

Riki sets out to find more members for the team.

Riki, Rin, and Masato go to great lengths to make sure their newest team member gets what she wants: a roommate.

Rin finds another message on Lennon. This time, the mission is to save the cafeteria. Later, Riki wonders how the message's author knew there would be a crisis in the cafeteria, just before he is hit by another narcolepsy attack...