You are my only one.

Sawaki Yukina has been abused by her entire family except her older brother from early childhood until her second year of middle school. Her mother directs hatred toward her, and her younger sister takes away everything except her best friend and older brother. Her first love was able to date her, but he quickly switched to her younger sister. Her second boyfriend only confessed to Yukina because he wanted to get close to her younger sister. All her friends except for one best friend go over to her younger sister. After her younger sister—the so-called beloved heroine—takes her third boyfriend as well, Yukina decides to give up on love. Then, before Yukina's eyes appears a man who is utterly perfect— Of course her younger sister will just get in the way... she'll take him from me... Even knowing this, Yukina is drawn to him... To Yukina, who desperately tries to seal away her feelings, her best friend and older brother say: "No, you can't escape anymore, so just give up and get married." This is my first post. It's something predictable with no surprises, but I appreciate your support.