Auf dem Schuldach trifft Riki Komari an, die im Schlaf etwas von einem älteren Bruder murmelt. Doch als sie aufwacht, erzählt sie Riki, dass sie ein Einzelkind ist und ihr Bruder nur in ihren Träumen erscheint, wo er ihr eine traurige Geschichte aus einem Bilderbuch vorliest und langsam verschwindet wenn sie erwacht.
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.
前向きで人懐っこい小毬は人見知りの鈴との距離も少し縮まり、すっかり大事なメンバーの一員になっていた。
ある日の昼休み、屋上で昼寝していた小毬を見つけた理樹は「お……おにいちゃん……？」という寝言を聞いてしまう。
小毬に話を聞くと、彼女は本当はひとりっ子で、いつも夢の中にだけ兄が現れてちょっぴり悲しいお話の絵本を読んでくれるのだという。
だがその後、小毬は夢の中に出てきた手作りの絵本が実家にあるのを見つけてしまうのだった――。
어느 날 점심시간, 옥상에서 낮잠을 자고 있는 코마리를 발견한 리키는 코마리가 잠꼬대로 “오빠…”라고 중얼거리는 것을 듣는다.
코마리의 이야기에 따르면 자신은 외동딸이지만 언제나 꿈속에서 오빠가 나타나 슬픈 그림책을 읽어준다고 하는데...
그런데 다음 날, 코마리는 꿈속에서 나온 그림책이 실제로 집에 있는 것을 발견한다.
小毬和怕生的铃关系有了点改善，成为了队伍中重要的一员。有一天，午休时理树在屋顶找到在睡觉的小毬时听见了“哥哥~？”这样的梦话。小毬说她只是独生女，经常只在梦里出现的“哥哥”给她读带点悲伤的画册故事。可是之后，那本原本只在梦中出现的手绘本却在现实中存在着……
