Kuroda Yui

Yui is introduced as Kazuhiko's childhood friend and the person that has known him the longest outside of Nanano.

A native of the town of Mihoshi, Yui's family owns a ryokan (a traditional-style Japanese hotel), which is where she spends her free time. While she is next in line to inherit the hotel, she has proven to be irresponsible and whimsical (much to her mother's chagrin). It is because of this that she has come to greatly depend on our protagonist to help her get things done.

Having known Kazuhiko since grade school, Yui knows quite a bit about him and has proven to not hold back when it comes to telling people about what he was like when they were little. As the osananajimi character, she has also had a crush on him since childhood. Being unable to express how she feels, she'll sometimes try to boss him around and is known to have constant arguments with him. Still, the good and bad times Yui has shared with Kazuhiko throughout the years are testimony to how strong her feelings are for him.

On a comic note, Yui has a tendency to jump to strange conclusions when talking with Kazuhiko. She also has an odd fascination with bananas, and is convinced they make a person intelligent.