"Yurumates3Dei Plus" is a slice-of-life comedy anime that revolves around the daily lives of a group of young adults living in a shared boarding house called Maison du Wish. The story primarily focuses on the interactions and humorous situations that arise among the residents, blending lighthearted comedy with moments of heartfelt camaraderie.

The central character is Sae, a college student who moves into Maison du Wish after failing her university entrance exams. Sae is earnest but often finds herself in awkward or comedic situations due to her lack of experience and naivety. She is joined by other residents, including Yuzu, a cheerful and energetic girl who works part-time jobs; Risako, a mature and responsible older sister figure who often mediates conflicts; and Katsura, a quiet and mysterious girl with a penchant for cosplay and gaming. The group is overseen by the landlady, Oba-san, who provides a maternal presence and occasionally offers advice or joins in the antics.

The narrative unfolds through episodic vignettes, each highlighting the characters' quirks and relationships. Themes of friendship, personal growth, and the challenges of young adulthood are explored as the characters navigate their daily lives. The humor often stems from the contrast between their personalities and the absurd situations they encounter, such as Sae’s attempts to study while being distracted by her housemates or Yuzu’s over-the-top enthusiasm for her part-time jobs. Despite the comedic tone, the series occasionally delves into more reflective moments, particularly when addressing the characters’ aspirations and insecurities.

The setting of Maison du Wish serves as a microcosm of their shared experiences, with the boarding house acting as both a physical and emotional anchor for the group. The interactions between the characters are the driving force of the narrative, with each episode offering a glimpse into their evolving dynamics. The series maintains a light, accessible tone, making it suitable for viewers seeking a relaxed and humorous portrayal of everyday life.