ʏᴏᴜʀ ᴘʀᴏᴍɪꜱᴇ | ʙᴀɴ x ʀᴇᴀᴅᴇʀ

(Y/n), the youngest child and only daughter of the Demon King, has a chance to leave her dreadful home she was sealed in and search for her eldest brother who betrayed her race 3,000 years ago. The plan was to persuade him to come back with her, but (Y/n) faces a problem when she encounters the Seven Deadly Sins, Brit...