(Kanao harem/centric fic) Kanao Tsuyuri. A 17-year-old girl going to Kimetsu Academy. All Kanao wanted to do was forget about the events of the past years with her sister Kanae was brutally killed at the hands of a notorious killer mafia Douma when she was 12 and her other sister death Shinbou at the hands of the very same killer at 16. Now Kanao seeks to make her sisters proud and graduate school while aiding the police in catching Douma plus trying to help the hearts of her sister's past lovers as they mourn beside her. What will happen when Douma re-appears going after Kanao next? Can she take him down for her sisters?