"Soreike! Anpanman: Kokin-chan to Aoi Namida" is a feature-length anime film based on the popular "Anpanman" franchise, which centers on the adventures of Anpanman, a superhero made of bread filled with sweet red bean paste. The story revolves around Kokin-chan, a young girl who lives in a small, peaceful village surrounded by nature. Kokin-chan is a cheerful and kind-hearted child, but she harbors a deep sadness due to the absence of her mother, who left the family years ago. Her father, a skilled craftsman, struggles to raise her alone while coping with his own grief.

The narrative takes a dramatic turn when Kokin-chan discovers a mysterious blue tear-shaped gemstone in the forest. This gemstone, known as the "Aoi Namida" (Blue Tear), possesses magical properties tied to emotions and memories. Unbeknownst to Kokin-chan, the gemstone is sought after by Baikinman, a recurring antagonist in the series, who plans to use its power for his own selfish purposes. Baikinman's schemes threaten not only Kokin-chan's village but also the balance of the world.

Anpanman, along with his friends such as Shokupanman and Currypanman, intervenes to protect Kokin-chan and the village. As the story unfolds, Kokin-chan's emotional journey becomes central to the plot. The Aoi Namida reacts to her feelings, revealing fragments of her memories and connecting her to her mother's past. Through these revelations, Kokin-chan begins to understand the sacrifices her mother made and the love that still binds their family.

The film explores themes of family, loss, and resilience, with Kokin-chan's emotional growth serving as the heart of the narrative. Anpanman's role as a protector and symbol of hope is emphasized, as he helps Kokin-chan confront her fears and find strength in her vulnerability. The climax involves a confrontation with Baikinman, where the power of the Aoi Namida is ultimately used to restore peace and heal emotional wounds.

The supporting characters, including Kokin-chan's father and the villagers, contribute to the story's emotional depth, highlighting the importance of community and support in overcoming adversity. The film maintains the franchise's signature blend of lighthearted humor, action, and heartfelt moments, making it accessible to both children and longtime fans of the series.