"Stand By Me Doraemon 2" is a sequel to the 2014 film "Stand By Me Doraemon," continuing the story of Nobita Nobi and his robotic cat companion, Doraemon. The narrative intertwines two key arcs from the original manga, focusing on themes of family, regret, and self-improvement. The film begins with Nobita struggling with his studies and facing pressure from his parents, particularly his grandmother, who wishes to see him grow into a responsible adult. After discovering an old photograph of his late grandmother, Nobita becomes overwhelmed with guilt for not fulfilling her expectations during her lifetime.

Using Doraemon's time-traveling gadgets, Nobita travels back in time to visit his grandmother as a child. During this emotional reunion, he learns about her unwavering love and support for him, despite his shortcomings. This experience deeply impacts Nobita, motivating him to change his ways and work harder. The story then shifts to a second arc, where Nobita and Doraemon travel to the future to witness Nobita's wedding day with his childhood friend, Shizuka Minamoto. However, Nobita becomes anxious and insecure, fearing he is not worthy of Shizuka. This leads to a series of comedic and heartfelt events as Nobita grapples with his self-doubt and seeks to prove himself.

The film explores the dynamics between Nobita, Doraemon, and their friends, including Shizuka, Gian, and Suneo, while emphasizing the importance of perseverance, self-belief, and the enduring bonds of family and friendship. Through its dual narrative structure, "Stand By Me Doraemon 2" balances humor, emotional depth, and life lessons, staying true to the spirit of the original manga while offering a fresh perspective on Nobita's growth and relationships.