Kyou has fallen in love for the first time in his life. There's just one problem--the girl he's in love with only has eyes for someone else: her straight best friend. Throw in a father who runs a drag bar, a goofy best friend, and an unexpected plot twist, and you have a story that blends realism, humor, and poignant drama.

Another old yuri manga, from the 70s. The character designs are quite similar to those of Shiroi Heya no Futari.
It's a horror story, in which the main character and her family go to their summer house for vacation and people start dying one by one. The twist is that the main character, Reina, is falling in love with her mysterious neighbor, Maya. But who is Maya really, and how does she know so much about Reina's family?

Having been forced to leave the side of passionate Rin three years earlier, Sarasa thinks she has found happiness again in the gentle arms of Akira. But fate plays bittersweet tricks when least expected, and what may have seemed like the past has its ways of catching up.
(Source: M-U)

This is the story of three girls who all realize that the boys they've been chasing aren't available at the same time, and so decide to meet on a Sunday to invite the first boys they see to a party they're going to put together. Of course, it's not anywhere near that simple, and the three boys/men they pick up are all connected although none of them are aware of it, and some events in their own lives are going to complicate things...
(Source: M-U)

Prosecutor Chiyuki Amamiya, who works at the western branch of the Tokyo district prosecutor’s office, can’t seem to choose between two men. One of them is his junior Yoshitaka Morooka, who used to help the family company, while the other is the former elite home office prince who fell from grace, Masachika Katori. Amamiya finds himself torn between the earnestness of Morooka and the mystery surrounding Katori. What fate awaits these men?
(Source: DMG)

It's about a rich man's daughter and a orphan boy growing up together and falling in love. But when her parents die, her aunt wants to send the boy away to college and make her marry a respectful man to save the family reputation.

[From mangatraders]

In a quiet area of France during WWII, a very young orphan boy was left on the steps of a large mansion on the same day that a daughter was born to the bourgeois family living there. From that day on, Francis and Natalie grew up together and found themselves falling deeply in love. As talk of their marriage began to stir, Natalie suddenly lost her parents to a plane crash, leaving her aunt as her guardian. This aunt, vehemently opposed to Natalie's engagement to a mere orphan, which drove Natalie and Francis to elope. Unfortunately, they were caught. Rather than be torn apart from each other, Natalie and Francis decide to spend eternity together by jumping off a cliff. Through a cruel twist of fate, however, only Natalie survives...Is there even a smidgen of hope that Natalie will somehow be able to find her love once again? An amazingly well-developed, emotional work of art from Ichijo Yukari.