 Despite Yuki's selfish reasons for inviting Sunako (which was to take pictures of her male companions and sell them to get a gift for her boyfriend), it is shown that the two do care for one another as Yuki considers Sunako her only friend and Sunako doesn't want to see Yuki get hurt and cry.Gin and Yae are Yuki's two younger siblings, who have a fond attachment to Yuki.Because Yuki left the house during their younger ages, he was not often around them as they were growing up, and is shown to want to be a big brother to them now, despite often accidentally causing misunderstandings with them because of this.