Yuri Kudou
Sayuri originally attended the same middle school as Kawasumi and Ryosuke, and she is now Suiren and Aya's newest and closest high school friend. She fully supports Suiren's relationship with Kawasumi, and she along with Aya try to form plans for them to get together. It is hinted that Sayuri has someone that she likes (they work in the same cafe) but his details were never mentioned.