Sick!Yuzu fic cuz angst. Yuzu suffers from brugada syndrome, a condition that causes a disruption of the heart's normal rhythm. She lives her life in peace until her new step sister, Mei, decides to steal her first kiss. Is the pain in her chest because of her condition or because of something else?

After her mother remarries, Yuzu becomes 'Aihara Yuzu' instead of 'Okogi Yuzu'. However, before her father passed away her last name was significantly more powerful and wealthier than the name she currently has. Her real name is Hayato Yuzu, rightful heir of the famous Hayato Clan that specializes in martial arts. Set after the Kyoto Arc.