Uryuu Yuiko

Uryuu Yuiko (瓜生唯衣子) is a relative of the Enjou family and is a marriage candidate to Enjou Shuusuke. She first appeared during the Suiran Academy’s School Festival in Shuusuke's 2nd year of high school.[c161] She is the same age as Shuusuke.

Bio
According to Katsuragi Haru, Yuiko is Shuusuke’s lover. Rumor has it that Yuiko is Shuusuke's girlfriend. However, when Kisshouin Reika had asked Shuusuke about Yuiko, he denied being her lover thrice. Instead, he describes Yuiko as a relative and as a “candidate” for his engagement. Although there has always been talk about his engagement, since there was nothing official, she is deemed as a candidate. [c163]

Apperance
Yuiko is a delicate-looking girl with black hair down to her shoulders. She has stark white skin and faintly moist eyes. Yuiko-san had a special atmosphere. It was transient and ephemeral like the moon rippling on the water. [c162]

Enjou Shuusuke
Yuiko is a marriage candidate of Shuusuke. They are very close to each other that they call each other in a first name basis. It is also apparent that Yuiko frequently visits Shuusuke's house. Shuusuke also makes her latte art.

Yuiko calls him Shuu.

Enjou Yukino
Enjou Yukino appears to be afraid of Yuiko, his expression a little stiff when he saw her in Suiran Academy.

Kisshouin Reika
Reika finds Yuiko scary, and she doesn’t think she could win against her. However, Reika finds Yuiko to be beautiful.

Katsuragi Haru
Katsuragi Haru and Yuiko are childhood friends. Haru have always adored Yuiko.