From Shoujo Manga Maniac:

Minori's childhood friend, Shin, has always been a crybaby and even though he's considered the charming prince of the school, Shin is still a crybaby in disguise! Minori consider him no more than a little brother, but is Shin's crybaby character his real character?

She had always hated the fact that her younger brother had been cuter than her. Now, he's at her school, dressed as a girl and as a popular model for female clothing. Although it's not unknown that he is not a girl, all the boys like him. Thus, she is always rejected by her crushes. They're brother and sister but is there something deeper going on? Her younger brother has always been cute, and now he's, even at school, dressed as a girl and a popular female model, but he's been keeping a secret: he loves his blood-unrelated older sister!

As children, twins Umi and Sora became acquainted with a four-year old Beniko. Years later, Umi has moved away, and Sora confessed to Beniko that he'll propose to her when she turns 18. But when Sora dies in a traffic accident, why does Umi appear before Beniko looking and acting just like Sora?
(Source: MU)