Asthma (Haikyuu x Reader)

It was obvious that Y/N had asthma. Every time she would overwork herself in volleyball, and soccer, she'd always have hard breathing, she would cough almost all the time, she'd have chest pressure, anxiety, and/or throat irritation. She even almost got killed once because of overworking.

When she enters Karasuno High, her asthma is immediately recognized by the principal. When she is introduced by the principal to part of the Karasuno team, the captain, and vice captain promise to not let the girl pass away or let her asthma get in the way.

But... what if she already had a promise that involves death? And she isn't gonna let it go until the teams starts getting suspicious? And what if they find out they fell in love with the asthmatic girl, along with the other Japan volleyball teams?