DOES ANYONE KNOW THIS MANGA!

A girls older sister is accepted into an all girl elite school and dies just her headband is sent back.She than enroles an finds out her sister was killed an all the girls fight to protect or steal each others armbands. Shes chased into a basement an finds a girl chained up she was her sisters protector and agrees to be hers to help find out who killed her! Can somone please help me find this manga or the title?
2019-05-31 20:55 marked

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