"Mairimashita to Iwasetai" is a manga series that blends elements of comedy, romance, and supernatural themes. The narrative centers around Momokawa Momo, a high school girl who becomes entangled with a demon named Iruma after accidentally summoning him. Iruma, a low-ranking demon with a mischievous yet endearing personality, is bound to Momo due to the summoning ritual. Despite his initial reluctance, Iruma begins to assist Momo in her daily life, often using his limited demonic powers to solve her problems, albeit with mixed results.

The story explores the dynamic between Momo and Iruma as they navigate both the human world and the demon realm. Momo, a kind-hearted and determined girl, often finds herself in humorous and chaotic situations due to Iruma's unpredictable nature. Over time, their relationship evolves from one of reluctant partnership to genuine camaraderie, with moments of romantic tension subtly woven into their interactions. The series also introduces other characters, including fellow demons and humans, who add depth to the narrative and contribute to the comedic and dramatic elements.

A recurring theme is the clash between the human and demon worlds, with Iruma serving as a bridge between the two. The manga delves into the cultural differences and misunderstandings that arise from this intersection, often using them as a source of humor. At the same time, it touches on more serious themes, such as identity, belonging, and the complexities of relationships. The plot progresses through episodic adventures, with each chapter presenting new challenges for Momo and Iruma to overcome, while also gradually developing the overarching storyline.

The characters are central to the series' appeal. Momo is portrayed as a relatable protagonist, balancing her ordinary high school life with the extraordinary circumstances brought about by Iruma's presence. Iruma, on the other hand, is a flawed yet likable character whose growth is a key focus of the narrative. Supporting characters, such as Momo's friends and rival demons, provide additional layers to the story, creating a rich and engaging world. The manga's tone remains lighthearted for the most part, but it occasionally delves into more poignant moments, adding emotional depth to the otherwise comedic premise.