"Sana Inui is a prominent character in the Japanese manga ""How to End an Unrequited Love."" She is a high school student who has fallen in love with her classmate, Daiki Yoshimoto. Sana is portrayed as a beautiful and intelligent girl who is successful in academics and sports. However, her unrequited love for Daiki has caused her deep emotional pain and led her to seek ways to end it.

Sana is introduced in the first chapter of the manga, where she is shown to be struggling with her feelings for Daiki. She is depicted as a shy and reserved girl who finds it difficult to express her emotions openly. Sana's name is first mentioned when her friend, Shika, expresses concern about her well-being and urges her to confide in her.

Sana's character development is a significant aspect of the manga. As the story progresses, Sana becomes more determined to overcome her unrequited love. She starts taking advice from various sources, including a popular author, Yuto Ohkubo, who writes books on romance and relationships. Sana's name is mentioned several times throughout the manga whenever she seeks guidance from others.

Sana's character also has several flaws, making her more relatable. She often becomes jealous and insecure when faced with the possibility of Daiki having a girlfriend. Sana's name is mentioned when she confronts Daiki's friend, Tatsuya, about rumors that Daiki likes someone else. This lack of trust in her crush makes Sana's character more complex and multidimensional.

Overall, Sana Inui is an essential character in ""How to End an Unrequited Love."" Her journey to overcome her unrequited love is one that many readers can relate to. Sana's character is well-developed, with both positive and negative traits, making her a realistic portrayal of a teenage girl. Her name appears frequently throughout the manga as she struggles to find a way to move on from her unrequited love."