If you're looking for manga similar to 5-tsu Kazoereba Kimi no Yume, you might like these titles.
Yozora starts her high school days at the Moonlight Academy, a school that specializes in music. She is chasing after Umiyuri-sama, a girl with a heavenly talent for singing.
Kamoshida is a highly superstitious fortune-teller who’s been living alone since his wife and child left. One day, a black cat wanders into his home, gives birth to two kittens, and vanishes without a trace. Kamoshida soon sees this as an opportunity to incorporate them into his fortune-telling business.
This is the story about a meeting of happenstance between two doppelgangers—Nero, a world-famous contemporary artist who has grown weary of his obligations; and De-Won, a poor college graduate trying to make the most of his last school vacation. A chance encounter at a hot spring in Japan has Nero convincing De-Won to switch places with him for three days, but will they be able to pull off the greatest deception when they come from such different worlds? Nero’s booked for a live painting performance at one of Japan’s most prestigious art galleries, and De-Won knows next to nothing about art!
When a wealthy man loses the fortune he invested in a diamond mine and dies shortly thereafter, his orphaned daughter loses everything and becomes trapped in a life of drudgery. Forced to work at the school she was previously being educated at to pay off the debt her father owed, Seira's once-beautiful life has transformed drastically. Her lessons become a thing of the past and her days are now filled with hunger, hard labor and abuse. Even so, the young girl remains pure-hearted in spite of her ill-treatment by letting her imagination help her deal with her many hardships.
Genki Ogasawara enrolled in a boys' high school, and he wants to join the club that will get him to be popular with girls. Having seen a performance of "Romeo and Juliet" made by the school's Drama Club, he fell in love at first sight with the one playing Juliet and made him sign up readily. Later he recalled that he's on a boys' high school. And so, Oga joins the Drama Club and faces the many problems and misadventures that await the club!