"Alps no Shōjo Heidi" is a 52-episode anime series that adapts Johanna Spyri's classic novel "Heidi." Set in the late 19th century, the story centers on Heidi, a spirited and kind-hearted orphan girl sent to live with her reclusive grandfather, known as the Alm-Uncle, in the Swiss Alps. Initially wary of others, the Alm-Uncle gradually warms to Heidi's cheerful and compassionate nature, and the two form a close bond. Heidi thrives in the idyllic mountain environment, befriending Peter, a young goatherd, and finding joy in the simplicity of rural life.

Heidi's life takes a dramatic turn when her aunt, Dete, returns to take her to Frankfurt, Germany, to serve as a companion for Clara Sesemann, a wealthy but frail girl confined to a wheelchair. Despite the luxurious surroundings, Heidi struggles to adapt to the rigid and formal lifestyle of the Sesemann household. She deeply misses the mountains and her grandfather, and her unhappiness begins to affect her health. Clara, however, grows fond of Heidi, and the two develop a strong friendship. Heidi's presence brings a sense of vitality and warmth to Clara's life, encouraging her to see the world with renewed hope.

The story explores themes of resilience, the healing power of nature, and the importance of human connection. Heidi's unwavering optimism and empathy touch the lives of those around her, including Clara's strict governess, Fräulein Rottenmeier, and Clara's kind-hearted grandmother. Eventually, Heidi's longing for her mountain home becomes unbearable, and she is allowed to return to the Alps. Clara later visits Heidi, and the fresh mountain air and Heidi's encouragement inspire Clara to take her first steps, marking a pivotal moment in her recovery.

The series balances emotional depth with a gentle, episodic structure, capturing the beauty of the Swiss Alps and the simplicity of rural life. Heidi's grandfather, initially portrayed as gruff and isolated, undergoes significant character development, revealing a tender and protective side. Peter, though initially envious of Heidi's attention to Clara, learns the value of friendship and selflessness. The narrative emphasizes the contrast between the freedom and purity of the Alps and the constraints of urban society, highlighting the restorative power of nature and human kindness. Through its heartfelt storytelling and memorable characters, "Alps no Shōjo Heidi" remains a timeless tale of love, perseverance, and the enduring bond between people and their environment.