"Dekiru kana" centers on the life of a young woman named Haruka, who struggles with self-doubt and a lack of direction in her career and personal life. After a series of setbacks, including losing her job and facing criticism from her peers, Haruka stumbles upon a small, unconventional café run by a mysterious owner named Aoi. The café, named "Dekiru kana" (which translates to "Can I do it?"), serves as a sanctuary for individuals seeking clarity and purpose. Aoi offers Haruka a part-time job, but the café operates under unique rules: each customer must share a personal story or challenge, and Haruka is tasked with helping them find solutions or insights.

As Haruka interacts with the diverse clientele, she encounters a range of characters, each grappling with their own struggles. These include a struggling artist unsure of his talent, a single mother balancing work and family, and a retired salaryman searching for meaning in his newfound free time. Through these interactions, Haruka begins to reflect on her own life, gradually gaining confidence and a sense of purpose. The café becomes a microcosm of human experiences, with each episode focusing on a different customer and their journey toward self-discovery.

Aoi, the enigmatic café owner, serves as a mentor figure, offering cryptic yet profound advice that often ties into the themes of the episode. While Aoi’s background remains shrouded in mystery, their wisdom and calm demeanor provide a stabilizing presence for both Haruka and the customers. The narrative explores themes of resilience, self-acceptance, and the importance of community, as Haruka learns that helping others can also lead to personal growth.

The series balances slice-of-life elements with moments of introspection, creating a reflective yet uplifting tone. Haruka’s evolution from a hesitant, uncertain individual to someone who embraces challenges and finds fulfillment in aiding others forms the emotional core of the story. The café itself becomes a symbol of hope and transformation, a place where people from all walks of life can find solace and encouragement.