"ToLOVERU" centers around Rito Yuuki, a high school student whose life takes a dramatic turn when he encounters Lala Satalin Deviluke, an alien princess from the planet Deviluke. Lala flees to Earth to escape an arranged marriage and chooses Rito as her fiancé, believing he will protect her. Her arrival introduces a series of comedic and chaotic events, as Rito struggles to balance his ordinary life with the extraordinary circumstances brought by Lala and her alien companions.

The narrative explores Rito’s interactions with Lala and her two younger sisters, Momo and Nana, who later join her on Earth. Momo, the middle sister, is a mischievous and flirtatious character who often meddles in Rito’s love life, while Nana, the youngest, is more tomboyish and initially skeptical of Rito’s intentions. The series also features a diverse cast of human and alien characters, including Haruna Sairenji, Rito’s childhood friend and secret crush, and Yui Kotegawa, a classmate with a strong sense of justice who frequently misunderstands Rito’s accidental perverted actions.

As the story progresses, Rito’s life becomes increasingly complicated by the arrival of more aliens, each with their own quirks and motivations. The series blends romantic comedy with science fiction elements, often focusing on Rito’s awkward and unintentional encounters with the female characters, which lead to humorous and sometimes tense situations. Themes of love, friendship, and self-discovery are woven throughout the narrative, as Rito navigates his feelings for Lala, Haruna, and others while trying to maintain peace in his chaotic life.

The plot is episodic in nature, with each episode or arc introducing new characters or challenges that further complicate Rito’s relationships. Despite the comedic tone, the series occasionally delves into more serious moments, particularly when exploring the backgrounds and motivations of the alien characters. The dynamic between Rito and the Deviluke sisters evolves over time, with Lala’s unwavering affection for Rito serving as a central thread throughout the story.

"ToLOVERU" is characterized by its lighthearted approach to romance and its blend of sci-fi and slice-of-life elements. The interactions between the characters drive the narrative, with Rito’s accidental perversions and the resulting misunderstandings providing much of the comedic tension. The series maintains a balance between humor and heartfelt moments, making it a mix of romantic escapades and intergalactic adventures.