A non existant heartbeat

Ahmya Shigaraki is the ' Adopted ' sister of Tomura Shigaraki, but one day when the two were talking Tomura said. " you say it'll be the death of you but it might just save somebody you love." this leaves Ahmya with a bad feeling and when her and Toumura get seperated her suspicions were confirmed. She has to use the one thing she has left to get him back.