Himouto! Umaru-chan

Taihei, a diligent and responsible older brother, struggles to manage his younger sister Umaru, whose messy habits and childish outbursts make life in their shared apartment chaotic.

Taihei returns home to find a tidy apartment and a surprise guest—Umaru has invited her classmate and neighbor Ebina over, concealing her usual gaming habits to present a different side of herself.

Umaru is caught off guard when her grumpy classmate Motoba appears at her door just as she is wearing her signature hood, raising concerns that her secret identity may have been discovered.

Umaru, known in the gaming world as UMR, competes in a prestigious fighting game tournament where she unexpectedly faces off against her school rival, Tachibana.

Umaru spends his summer vacation relaxing and enjoying time at the arcade, teaching others the art of lazy summer fun. Meanwhile, Taihei goes through a routine day at his job.

Taihei and Umaru explore the balance between shared living and individual freedom in their small apartment, but their playful attempt at simulating life's challenges through a board game leads to uncomfortable realizations about their own relationship.

Taihei is followed by his coworkers after they notice him spending time with an attractive woman they believe to be his sister. One of them visits his home to investigate and meet her for himself.

The Doma family enjoys a relaxed winter spent under the kotatsu, with Umaru contemplating the events of the past year while Taihei seeks to have her fulfill a promise she once made to him.

On Valentine's Day, Kirie struggles with baking cookies, Ebina tries her hand at making chocolate, and Umaru avoids cooking responsibilities by leaving them to Taihei.

Umaru falls ill, and her lazy personality even affects the germs causing her sickness, though they still target her brother. Meanwhile, Taihei reflects on an arcade visit from a decade earlier.

Umaru and Ebina bond over their shared love of snacks, while Umaru's internal council deliberates on the ideal treat. Meanwhile, Taihei attempts to get Kirie excited about the upcoming summer season.

Umaru faces a potential dilemma as her different friend groups unexpectedly come together during a highly anticipated beach trip, putting her secret at risk of being exposed.

Umaru Doma spends an evening playing video games in the absence of her overprotective older brother, before joining her friends for an energetic game of soccer.

Taihei hosts a dinner for his coworkers, and one of them, Alex, piques Umaru's curiosity. Umaru can't shake the feeling that Alex looks familiar and is intrigued by his passion for anime.

Alex interrupts Kirie and Umaru's quiet time to play a dating simulation game, drawing Kirie into its narrative. As she becomes engrossed in the story, Umaru stumbles upon a different game that quickly captures her attention.

Umaru spends Christmas with her friends, while Sylphyn reflects on a cherished childhood Christmas memory. On New Year's Day, Umaru is given an unusual gift by Taihei, sparking curiosity and concern.

Taihei goes on a business trip with his colleagues, while his boss, Kanau, looks for an opportunity to spend time with him. Meanwhile, Taihei deals with an unexpected stowaway who is eager to enjoy the trip.

Kirie's hidden ambition is discovered during her visit to Umaru. With Umaru's support, she begins to confront her insecurities and question whether she has the confidence to pursue her dreams.

Umaru and the girls visit an amusement park for a day of fun, but Kirie faces some personal challenges that threaten to spoil the outing.

Umaru and his friends organize an impromptu gathering, but their plans quickly spiral into unexpected and chaotic situations, leading to a series of comedic mishaps.

Taihei receives an old camera from Bomba and uses it to spend time rekindling his relationship with Umaru. Meanwhile, tensions between Hikari and Umaru begin to rise.

Sylphin invites UMR to her home, but a small misunderstanding creates some tension among the group. Later, Umaru discovers what may be a vulnerability in Hikari's armor.

Kirie creates a scheme to help Ebina and Taihei grow closer, but Taihei finds himself overwhelmed by the increasing number of sisters vying for his attention.

As the year comes to a close, the group grapples with the challenge of selecting meaningful Christmas gifts for their friends and family. Umaru and his classmates embark on a humorous and heartfelt journey to find the perfect presents.