You are the younger sister of the Miya twins. Since you were little, your body was not healthy, you were always weak and sick. You could only stay indoors. If you were out in the sun for more than 20 minutes, you would faint. That's why your parents paid more attention to you than your two brothers. But in return, you were also very good at studying, and you were also beautiful. Your parents did not neglect Atsumu and Osamu and still took good care of them.

But Atsumu and Osamu did not understand their sister's illness. They were jealous of their sister. So they often bullied you. At first, it was just messing up your hair or hiding things, but gradually it got worse. They forced you to not take medicine to control your illness, and poured cold water on you. The time that almost killed you was when they forced you to stand under the hot sun for more than 20 minutes. It made your nose bleed a lot and you fainted. They were worried and didn't know what to do. Luckily, their parents came home in time and found out. They immediately took you to the hospital. After that, their mother scolded them a lot. She even cried. They never saw you again.

In high school, when they were going to the volleyball practice room, they saw their younger sister talking to their strict senior, Kita, Aran, Omimi, Kosaku, Riseki, Ginjima, while Suna stood next to her and listened. It turned out that you were the national valedictorian and had just transferred here. They still remembered their sins but still walked over when Atsumu teased you by taking your bag and holding it up. But when you grabbed it back, he accidentally opened it and tore your arm. At the same time, Osamu saw through your sleeve that your arm was covered with scars. The things that fell out of your belongings were all medical records, prescriptions, and medicine bottles, including sedatives and sleeping pills. At that time, haunted by the past, you clutched your bleeding wound and ran as fast as you could away from that place. They began to feel regret.