Onii-chan to Issho (official English title: Me & My Brothers) revolves around Miyashita Sakura, a second year middle schooler whose grandmother, who she lived with, recently passed away. Sakura then spent her days alone in her grandmother's big house until one day, she came home to find four strange men she has never met before living there! They explain to Sakura that until she was three years old she had lived with them, along with their mother and father.There's the oldest brother Masashi, a romance novelist who crossdresses when he isn't writing. The second brother is Takashi, who becomes a teacher at Sakura's junior high. The third brother is the brash Tsuyoshi, a high school graduate and ''full-time part-timer" with a dream of owning his own shop. The fourth and youngest brother is Takeshi, a current high school student.At first Sakura finds their presence to be intrusive, and is especially alarmed when she accidentally learns that she and her brothers are not blood related. Eventually, she grows to appreciate their dedication to her as a little sister and values all of their moments together as a family.As time goes on, Sakura graduates junior high and enters highs school. She finds herself becoming even closer to one of her brothers ... and not as a sister.Written and illustrated by Tokeino Hari.
Arranged Marriage — The family's Oba San Michiyo, who raised Masashi after the death of their parents, arranged an omiai for Masashi for her husband's business associate's daughter. However, Masashi informed Michiyo he would turn the daughter down for Sakura.
Author Avatar — Portrays herself as a wind-up clock in the side columns in the manga.
Cannot Spit It Out — Sakura's first attempt at confessing to Masashi. Masashi, on the other hand, does not want to admit his mutual feelings to himself.
Cool Big Sis — Masashi tries to have Sakura identify with him as a big sister and calling himself such by wearing fashionable women's clothing, doing his hair, and taking Sakura clothes shopping. This is all so that he could distance himself from Sakura's growing affections towards him.
Doppelgänger — Murakami Michi, a women's magazine employee interviewing Masashi - who looks like Sakura's deceased mother Fumiko - informs him that, afer meeting Sakura, she is not interested in men and delightedly says that Sakura is "just her type." She fawns over Sakura whenever she has an opportunity.
Hair Decorations — Sakura does not do this often since she sports a short bob, but when she does, it works. Masashi cannot help but do this as well.
Face of a Thug — Coach Matsubara. Mistaking Masashi as a woman, he proposed to him. Matsubara is a widower and wanted to find a new mother for his young daughter Haruko. Tsuyoshi can also be considered for this trope as he often gets annoyed with Masashi's antics. Oosaki-sensei fits this trope as well.
Festival Episode — There are two. Sakura and her brothers first went to a traditional Japanese festival, where Sakura ended up being a temporary Peggy Sue (except she keeps her current age) with a fourteen-year-old Masashi. The second festival is the fireworks festival that she and Masashi attended.
Filler Villain — Asada Tomoaki, self-proclaimed rival novelist to Masashi. He kidnaps Sakura in order to neutralize any energy she had been giving Masashi towards his writing and take some for himself.
First Kiss — After suffering amnesia and cutting his hair short, Masashi seeks out Sakura at the park, cups her head in his hands, tells her she is not his sister, and they kiss - all in the second-last chapter of the series.
Flower Motifs — Seen often on the manga covers, drama CD cover, and as backgrounds in the manga. Sakura and her brothers wear daisies in their hair on the cover of Volume 1. Cherry Blossoms are often seen as well.
Masashi and Sakura's inevitable Relationship Upgrade is about as subtle as a sledgehammer to the face. Anyone with even a rudimentary knowledge of shoujo cliches/tropes can see it coming from a mile away, what with every friggin' chapter making a point to remind the reader that they aren't ''actually'' blood-related, a chapter in the very first volume dedicated to Masashi's lost love for Sakura's mother (whom Sakura resembles mightily), that same chapter explaining that the then-three-years-old Sakura declared she would marry Masashi—a dead giveaway—and many more tip-offs.
Indirect Kiss — Sakura worries over this when trying Katagiri's cooking with the spoon he was using to eat with. This also happens with Masashi at the fireworks festival when he offered her his bitten candied apple.
Not Blood Siblings — The manga takes great pains to remind the reader nearly every chapter that the heroine is in fact not blood-related to the titular brothers, despite the also-incessant reminders that they are all family and that Sakura is their "little sister." This is used quite blatantly so Sakura can be obsessively fawned over by her new guardians—and eventually fall in love with one of them—without the squick.
Older than They Look — Takeshi is often mistaken as the oldest brother due to his goatee and quiet demeanor.
Parental Abandonment — When Sakura was three, her mother and stepfather died. Years later when she lives with her brothers again, she finds out her biological father is Fukasawa Taizo, who runs his own coffee shop. He left Sakura's mother Fumiko in order to become the "ultimate barista," and always missed her. He first tells Sakura not to think of him as her father and left for Italy, but returns when he changes his mind and is now a part of her life.
Promotion to Parent — Mainly Masashi and Takashi towards Sakura. Masashi admits this more than anyone else.
Samurai — Nana sometimes calls his twin sisterNene "samurai hair," likely due to her wide bangs off her forehead and long straight hair. Tsuyoshi also dresses as one during Sakura's field trip to Kyoto.
The Shinsengumi — Sakura and Katagiri dress as 16th to 19th century police in a movie theme park during their class field trip to Kyoto. Other regular characters dress as other people from the same time period at the park.
Wholesome Crossdresser — Masashi, and averted for Rin. Masashi feels that, as a romance novelist, if he dresses and acts femininely he can better understand the female mind and use this in his writing. Rin, who is transsexual - as she admits she is a woman at heart - is the Unlucky Childhood Friend of Tsuyoshi, whom she likes.
Wingding Eyes — Masashi is the most guilty of this. Michiyo also does this when once reminiscing about Masashi growing up, with stars in her eyes. Setsuko does this when she first sees Tsuyoshi and mistakes him for a younger version of her deceased husband.