I was fascinated with the art style when I found this manga because it looks so detailed and dark. So in this case the first impression is not wrong, It's a bittersweet story with a lot of deep work behind. It's always a pleasure to find this type of manga because add something new and fresh at the genre, in this case to the Boys love. I wasn't sure if is correct to catalog the manga as BL because is not the main topic but in Myanimelist is listed like that so Its ok.
I would not read it again and thats why I put 7 in score. Its a good manga but I haven't been able to emphatize or connect with the characters. I didn't see a motivation in the main character, he didn't even look human and maybe is for all the trauma that he has been trought but I just didn't connect.
