"Daisuki!! Yuzu no Kosodate Nikki" centers on Yuzu, a young woman who unexpectedly becomes the guardian of her five-year-old half-sister, Sora, after their parents pass away in an accident. Yuzu, still in her late teens, must navigate the challenges of raising a child while balancing her own life, including her studies and part-time job. The narrative explores the daily struggles and joys of their new life together, highlighting the bond that forms between the sisters as they adapt to their circumstances.

The story delves into themes of responsibility, family, and personal growth. Yuzu, initially overwhelmed by her new role, gradually learns to care for Sora with the help of friends and neighbors. Sora, a cheerful and curious child, brings light to Yuzu’s life, though her energetic nature often complicates matters. The manga portrays their evolving relationship through a series of heartfelt and humorous moments, capturing the realities of single parenthood and the resilience required to overcome life’s obstacles.

Supporting characters include Yuzu’s classmates and coworkers, who provide emotional and practical support, as well as Sora’s kindergarten teacher, who offers guidance on childcare. The series also touches on societal perceptions of young guardians and the challenges they face, adding depth to the narrative. Through its episodic structure, the manga balances lighthearted slice-of-life moments with more poignant reflections on loss, love, and the meaning of family.