Ouji no Kikan

From Girls' Generation Scanlations:

1-2) Ouji no Kikan
Satake Kou attended the wedding of his sister where he was reunited with his cousin, Fumihiro, who used to be a very dumb fat guy, then transformed into a charismatic prince! Kou became undeniably self-conscious about this while not being aware of Fumihiro's high regards towards him since they were little. Fumihiro's admiration has turned into something complex. How would Kou respond to Fumihiro's feelings?

3-6) Metamorphosis
Adachi has been friends with Ritsu since they were children. Suddenly, Ritsu starts changing and acting like Adachi has never seen him act before... and the reason for that change seems to be Ritsu's new senpai, a troublesome guy. Adachi slowly realizes that he feels more than just friendship towards Ritsu... but it's too late.

7-9) By His Side

10) Ouji no Kikan Extra