Discovering a damaged teddy bear discarded by his mother, Nobita recognizes it as a gift from his late paternal grandmother. This sparks an intense emotional reaction, compelling him to ask Doraemon for help traveling back to his early childhood when she was alive. His goal is to revisit treasured moments and apologize for his past behavior toward her. During the journey to his three-year-old self, Nobita witnesses his younger version acting ungratefully and impatiently with his grandmother, including a tantrum over the teddy bear's damaged eye. Distressed by this sight, present Nobita intervenes, scolding his younger self. Though Doraemon plans to leave, Nobita chooses to stay, secretly entering his childhood home. In a pivotal encounter, Nobita interacts directly with his grandmother. She instantly recognizes him as her grandson despite his age. At her request, he shows his current elementary school bag as proof of his identity and growth. Emotionally, he reveals he is Nobita from seven years in the future. His grandmother expresses a heartfelt wish to witness his future happiness, specifically mentioning her desire to see him married. This experience reshapes Nobita's view of family bonds and memory. After returning to the present, his mother repairs the teddy bear. The narrative concludes with a parallel scene showing his grandmother gifting the repaired bear to his younger self, reinforcing affection's continuity across time. This storyline later becomes a key narrative component in *Stand by Me Doraemon 2*, where Nobita, motivated by his grandmother's wish, travels to his wedding day with Shizuka Minamoto. Complications arise when the adult Nobita doubts and flees the ceremony, creating a temporal conflict requiring resolution. This extension explores Nobita's enduring emotional connection to his grandmother and his drive to fulfill her hopes for his future happiness.