From StarryHeaven:
Doumyouji decides to be kind to Rui and try to set him up with a girl named Kimiko, however the girl isn’t exactly who everyone thinks she is. And while searching for who exactly this Kimiko could be, Doumyouji asks Tsukushi to marry him. It is during this time of reflection that Rui realizes where his true place is and that another love does exist for him.

A spin off of Hana Yori Dango (Boys Before Flowers).