"Kira Kira Hikaru 2" is a continuation of the story centered around Hikaru, a young girl with a unique ability to see and communicate with supernatural beings, particularly ghosts and spirits. The narrative builds on the foundation laid in the first installment, delving deeper into Hikaru's interactions with the spirit world and her efforts to help both the living and the dead resolve their lingering issues. The series maintains a balance between lighthearted moments and more serious, emotionally charged encounters, reflecting the duality of life and death.

The plot progresses as Hikaru encounters a variety of spirits, each with their own unresolved grievances or desires. These spirits often seek her assistance to fulfill their final wishes, which range from simple tasks like delivering messages to the living to more complex challenges involving uncovering hidden truths or confronting past traumas. Hikaru's ability to see and interact with these entities places her in a unique position to bridge the gap between the two worlds, though it also exposes her to the emotional weight of their stories.

Key characters include Hikaru's close friends and family, who provide support and grounding as she navigates her extraordinary circumstances. The relationships between Hikaru and these characters are explored further, highlighting how her abilities impact her daily life and interactions. Additionally, new characters, both human and supernatural, are introduced, adding depth to the narrative and expanding the scope of the story.

Themes of empathy, closure, and the interconnectedness of life and death are woven throughout the series. Hikaru's journey is not only about helping spirits find peace but also about her own growth as she learns to navigate the complexities of her gift and the responsibilities it entails. The series maintains a consistent tone, blending moments of humor and warmth with poignant reflections on loss and the human experience.