Yui Nanasato/Relationships

Shōta Katsuragi
Shōta and Yui were childhood friends and classmates in the past. Also, Yui was actually Shōta's first crush among the many he had. She has developed feelings for Shōta back in elementary school, as he always tried to help her whenever she was bullied by their other classmates. During the summer prior her transfer to another school, she saw Shōta again working by the seaside restaurant, but was unable to confess her feelings to Shōta. It was not until Sana and Shōta's first date where Yui reappears ever since her transferal to another school in the third grade, and has been showing affection for Shōta. She reveals to Shōta later that she transformed herself to a gravure idol to improve her identity and for Shōta to notice her more, and then confessed her feelings towards him during the Maple Leaf festival, but was rejected. She came to terms about it later on.

Sana Shinomiya
Yui considers Sana as her love rival with Shōta. When she found out that Sana and Shōta were going out as a "pretend couple," she took action and also did the same. Although they share the same love with the same boy, they are actually in really good terms. Also, whenever she sees Shōta admiring something that Sana does, she tends to copy what Sana does. After Sana and Shōta confessed their feelings towards each other, Sana and Yui became distant from each other. They came to terms again when Kotori helped them get together.

Kotori Kasuga
In her pursuit of gaining one of the lead roles in Koisome Momiji, Kotori marked Yui as the second target just in case she couldn't get Sana to mess up and get released from her role. In order to do so, Kotori blackmailed Shōta and had him confess to her in front of the two. This caused the two to be distracted in their line of work. Later on, Yui had suspicions of their relationship, as her manager had told her that she should watch out for her. When she saw Shōta searching for something in the river for Kotori, Yui, along with Sana, decided to help Shōta. Later on, Kotori apologizes and explains to them her current situation. Yui offered help, but instantly rebuked it, seeing that she might not fit according to her manager's standards. They then became friends here.

Later on, Kotori made Sana and Yui make up after Sana confessed her feelings to Shōta and the two became distant towards each other.

Umine
Umine was one of Yui's friends in elementary school when she transferred in. They played quite a lot, and at times, when Yui gets bullied, she stands up for her. When Yui met Umine again during high school, the two caught up with each other, Umine being surprised by the huge change Yui underwent. Umine supported Yui on her love towards Shōta, and even supported her after she got rejected by Shōta.