While family shapes come in many forms, “Uchi no Otouto-domo ga Sumimasen” is a work that depicts the encounter with a “new family” in a very warm and slightly bittersweet way. During her high school spring break, the protagonist, Ito, moves to a new house due to her mother's remarriage, imagining a peaceful life with her new stepfather. However, waiting for her there was not just her stepfather, but a communal life with four younger stepbrothers, all differing in personality and age. Although the sudden start of living with so many people is a series of confusions, as she gradually gets in touch with their individual personalities and distances, it develops into a story that makes her think about what a true family really is.

A major charm of this work is that no two of the four younger brothers share the same personality. The oldest brother, Gen, who seems blunt but cherishes his family; the second brother, Raku, who has a calm atmosphere and observes his surroundings well; the third brother, Syu, who tends to avoid appearing in public; and the youngest brother, Rui, who is bright and friendly. Since each has a different charm, just watching the interactions among the brothers naturally brings a smile to your face, and you will find yourself drawn into how their distance with the protagonist gradually closes. It is not just lively; because each person's feelings and growth are carefully depicted, it is a work where you will grow fonder of all the characters the more you read.

The story progresses with a light atmosphere as a home comedy, but it does not end there. While their initially awkward relationship gradually changes through daily life and their bond as a family deepens, emotions the protagonist has never felt before also begin to sprout in her heart. This change is by no means a sudden development; because it is carefully depicted by accumulating casual conversations and daily events, it can be accepted very naturally. The way the warmth of spending time as a family and the excitement unique to romance works are depicted in an exquisite balance can be said to be a highlight unique to this work.

What I actually felt upon reading is that the atmosphere among the characters is very comfortable. While it makes you laugh heartily in funny scenes, it also firmly depicts kindness in caring for one another and feelings that make them unable to be straightforward precisely because they are family, making it easy to empathize. Despite being a romance manga, its completeness as a work depicting family bonds is high, leaving a warm feeling after finishing it. It is a work where you can enjoy not only the romance element of who will fall in love, but also the very process of them becoming a real family, giving it a charm that makes you unable to stop turning the pages.

With a live-action film adaptation in 2024 and the cumulative circulation of the manga volumes surpassing 3 million copies as of May 2026, the reason why it is supported by so many readers is well-conveyed. “Uchi no Otouto-domo ga Sumimasen,” which exquisitely packs laughter, excitement, and a heartwarming family story, is highly recommended not only for those who like love comedies, but also for those who want to thoroughly enjoy the growth of the characters and their relationships. Even if the beginning of the reading gives the impression of a lively home comedy, the charm of each character deepens the more you read, and before you know it, you will feel that it is a manga filled with such gentleness that makes you want to watch over this family's everyday life even more.