L.Bergljot's manga / #prequel(1)

Apparently the order is: 1 Aru Otoko no Uta - http://www.mangago.me/read-manga/aru_otoko_no_uta/ 2 Yoru To Asa No Uta - http://www.mangago.me/read-manga/yoru_to_asa_no_uta/ 3 Aru Otoko no Higeki - http://www.mangago.me/read-manga/aru_otoko_no_higeki/ 4 Yoru To Asa No Uta EC - http://www.mangago.me/read-manga/yoru_to_asa_no_uta_ec/