It was oneshot about a guy who get a package from hell or devil service and inside it was a demon who will grant the guy his most desired wish or something also i remember the guy sister was a really bitch
http://www.mangago.me/read-manga/teikoku_kyoudai/an/teikoku-kyoudai-chapter-Volume%2003%20Extra%20-%20Hells%20Express%20%5BOneshot%5D.html
Thank you ヾ(☆▽☆)
It was oneshot about a guy who get a package from hell or devil service and inside it was a demon who will grant the guy his most desired wish or something also i remember the guy sister was a really bitch