"Plus-Sized Elf" is a comedic and slice-of-life manga series that centers around the daily life of Tomoatsu Naoe, a massage therapist, and his interactions with a group of elves and other fantastical beings who have crossed over into the human world. The story begins when Elfuda, a plus-sized elf from another dimension, visits Naoe’s massage clinic seeking relief from back pain caused by her unhealthy lifestyle. Despite her initial reluctance to change her habits, Elfuda becomes a recurring client, and her presence introduces Naoe to a variety of other supernatural creatures, each with their own quirks and challenges.

The narrative explores the humorous and often absurd situations that arise as these fantastical beings adapt to human society. Elfuda, in particular, struggles with her love for junk food and sedentary habits, which frequently lead to comedic misunderstandings and physical ailments. Other characters include Kuroeda, a dark elf with a penchant for overeating; Syrup, a fairy who enjoys human sweets; and Olga, a warrior elf who becomes self-conscious about her muscular physique. Each character’s unique traits and cultural differences from their respective worlds create opportunities for lighthearted comedy and occasional moments of introspection.

The manga balances its comedic tone with occasional themes of self-acceptance and body positivity, as the characters navigate their insecurities and societal expectations. Naoe, as the human protagonist, serves as a grounding presence, offering practical advice and support to the elves while often finding himself caught up in their antics. The series does not follow a strict overarching plot but instead presents episodic adventures and character-driven scenarios, focusing on the interactions between the human and supernatural worlds. The humor often stems from the contrast between the elves’ fantastical origins and their mundane, relatable struggles in the human world, making "Plus-Sized Elf" a light-hearted and entertaining read.