RYUUZOKU TO REIJOU NO BAN OMO SUGIRU NI SENNEN, DEKIAI

This is an otherworldly romance story centering on Elna, a girl with mysterious scales on her body. Having lost her only loving mother to illness, she is scorned by her father, stepmother, and stepsister, treated like a servant. The only thing that sustains her in her loneliness is her longing for the dragon lord who lives in a powerful kingdom in the sky. (Source: Natalie, translated) — Description from AniList community (anilist.co).