Manga/Manhwa/manhua Spoiler efforts never betray olimpos coponicus no kokyuu j no subete Secret alliance Deadman wonderland Smokin parade dansei kyoufushou datta watashi ga av jouyu ni naru made no hanashi baraou no souretsu Brother in the doll mou tamago wa korosana Living stone annarasumanara transjitter Shared boyfriend The beautiful ones miss guillotine Neko to ookami Bad candy you give me this world needs to be cursed hachigatsu kokonoka boku wa kimi ni kuwareru kuzu no honkai Dolly kill kill what she likes are homos and not me kawaii Bloody junkie Tokage no ou momo the blood taker hideout koko wa ima kara rinri desu smokin parade ayeshah s secret i love you kyouko san aku no kyouten penalty school Life is money smells like green spirit the euthanasia facility Novels: link
kaifuku jutsushi no yarinaoshi there's both novel and manga version being translated (oh yeah and it apparently even got an anime adaption somehow) It's definitely dark theme... but it's not similar to the way to protect the female lead's brother