"Soreike! Anpanman: Yūreisen o Yattsukero!!" is a feature-length anime film based on the popular "Anpanman" franchise, which centers on the adventures of Anpanman, a superhero made of anpan (a Japanese sweet bread filled with red bean paste). The story begins with Anpanman and his friends encountering a mysterious ghost ship that appears in their town. The ship, known as the Yūreisen, is said to be haunted and carries an eerie presence that frightens the residents.

The plot unfolds as Anpanman and his companions, including Baikinman, Shokupanman, and others, investigate the origins of the ghost ship. They discover that the ship is connected to a tragic past involving a young boy named Tetsu, who was separated from his family and transformed into a ghost. Tetsu’s spirit is bound to the ship, and his sorrow has caused the vessel to drift aimlessly, causing disturbances in the town.

As Anpanman and his friends delve deeper, they learn that Tetsu’s family was lost at sea, and his lingering attachment to the ship stems from his desire to reunite with them. Anpanman, driven by his unwavering sense of justice and compassion, resolves to help Tetsu find peace. The narrative explores themes of loss, redemption, and the power of kindness as Anpanman and his allies work to break the curse of the Yūreisen.

The film features a mix of action, emotional moments, and lighthearted humor, characteristic of the "Anpanman" series. Key characters include Anpanman, who uses his ability to share pieces of his head to help those in need; Baikinman, a mischievous antagonist who occasionally aids the heroes; and Shokupanman, a loyal friend who supports Anpanman in his quest. The story culminates in a heartfelt resolution as Anpanman’s efforts lead to Tetsu’s reconciliation with his past, allowing the ghost ship to finally rest. The film maintains a balance between its fantastical elements and its emotional core, making it a memorable entry in the "Anpanman" franchise.