If by sleaze you mean sex, as others have answered, go with Yofukashino Uta by Creepy Nuts. Japanese rap. Look up the video on YouTube and enable subtitles if you don’t understand Japanese. It’s a funny video, but it’ll also tell you exactly what he’s saying (they translate the title as Stayin’ Up Lullaby, but it’s also known as Call of the Night, as in the manga it inspired and its anime adaptation).
As far as depressing… I’m gonna go with Shirushi by LiSA because it’s the ending theme to the saddest anime I’ve seen — the last arc in season 2 of Sword Art Online. I don’t know what she’s saying but it sounds like it fits. See also any of the openings or endings from Your Lie in April, especially if you know what they’re about.
…because everyone else is just gonna post western music.
If by sleaze you mean sex, as others have answered, go with Yofukashino Uta by Creepy Nuts. Japanese rap. Look up the video on YouTube and enable subtitles if you don’t understand Japanese. It’s a funny video, but it’ll also tell you exactly what he’s saying (they translate the title as Stayin’ Up Lullaby, but it’s also known as Call of the Night, as in the manga it inspired and its anime adaptation).
As far as depressing… I’m gonna go with Shirushi by LiSA because it’s the ending theme to the saddest anime I’ve seen — the last arc in season 2 of Sword Art Online. I don’t know what she’s saying but it sounds like it fits. See also any of the openings or endings from Your Lie in April, especially if you know what they’re about.
…because everyone else is just gonna post western music.