"Nyaruko: Crawling with Love!" is a comedic anime series that blends elements of romance, science fiction, and parody. The story centers on Mahiro Yasaka, an ordinary high school student whose life takes a bizarre turn when he is attacked by extraterrestrial beings. He is rescued by Nyaruko, a quirky and energetic alien girl who claims to be a member of the Space Defense Agency. Nyaruko reveals herself to be Nyarlathotep, a deity from the Cthulhu Mythos, though her cheerful and mischievous personality starkly contrasts with her eldritch origins.

Nyaruko develops an intense romantic interest in Mahiro, often expressing her feelings in exaggerated and comedic ways. Despite Mahiro's initial reluctance and frequent exasperation with her antics, the two form an unlikely partnership as Nyaruko continues to protect him from various alien threats. The series introduces additional characters, such as Hasuta, a male alien resembling a cute boy who is also a Cthulhu Mythos entity (Hastur), and Kuuko, a fiery and competitive alien girl (Cthugha). Both characters add to the chaotic dynamics, often competing for Mahiro's attention or causing humorous misunderstandings.

The plot unfolds through episodic adventures, with Nyaruko and her companions facing off against a variety of alien adversaries, many of whom are also inspired by Lovecraftian lore. These encounters are often played for comedy, with over-the-top action sequences and absurd situations. The series frequently parodies anime tropes, pop culture references, and even its own source material, creating a lighthearted and self-aware tone.

Throughout the series, the relationship between Mahiro and Nyaruko evolves, with Mahiro gradually warming up to her despite his constant protests. The supporting cast, including Mahiro's human friends and other alien entities, contribute to the comedic and occasionally heartfelt moments. While the primary focus remains on humor and parody, the series occasionally touches on themes of friendship, acceptance, and the unpredictability of love.

"Nyaruko: Crawling with Love!" is characterized by its fast-paced humor, eccentric characters, and playful subversion of both sci-fi and romantic comedy genres. The narrative thrives on its absurdity and over-the-top scenarios, making it a distinctive entry in the realm of anime that combines supernatural elements with comedic storytelling.