Shiina

Shiina otherwise referred to by his nickname Shii is another adult friend of Shichi and Yoshino. He was Yukis classmate in elementary school and he eventually became her boyfriend after her transition and due to her persistence. Unlike Yuki Shii had many friends in school. He generally just watches over Shichi and Yoshino with Yuki but he does sometimes do bold and unexpected things such as grabbing Yoshinos crotch when the two of them first meet because he feared that she who was dressed as a boy at the time might be Yukis illicit lover in an affair.