If you're looking for manga similar to Hirunaka no Ryuusei, you might like these titles. All recommendations are made by Anime-Planet users like you!
Ao Haru Ride revolves around Futaba, a girl who was in love with a boy named Kō Tanaka in middle school. However, after a misunderstanding, their relationship as friends ends when he transfers schools over summer vacation. In high school, her world is turned around once again when she meets Kō again, this time under the name of Kō Mabuchi.
They are both shoujo highschool romances with lots of romantic conflict and really cute characters! I read Hirunaka no Ryuusei first, but really love Ao Haru Ride too!
Hirunaka no Ryuusei and Ao Haru Ride shares the same feel in a way. No insane drama, slow paced and really allows you to get to know the characters and understand the choices that they make. If you like one, I'm certain you'll like the other.
When Fumino Kaji’s parents died, she and her young brother, Teppei, were ferried from relative to relative. One day when they're finally fed up of being passed around, the pair decide to run away from home. Alone in the world, help arrives from the most unexpected source, Fumino's English teacher, Kazuma, who offers to take them in. Not believing that he means to commit to the idea, Fumino jokingly agrees to the idea but only if he will take her in as his wife and much to her surprise he agrees! Now the three live together with Fumino and Kazuma acting as man and wife in name only, but after falling for each other, the pair must try to act normally at school to ensure that no one discovers their secret.
Both are non typical shoujo that involve a love triangle with two guys and one girl and throughout the slow paced stories, you can't predict who the heroine would end up with. You see that the heroine is in love with the "first" guy but then later meets the "second" guy. The situations and events that take part in these story are very alike and both are worth a read.