Basically Derya, a lore enthusiast dies and gets reincarnated into the world of "Just like my twin", as 'Arius Conrad Ambrose', the twin of the heroine from the title. Although, there's a teeny-tiny problem . . . The twin was supposed to die. Well, he didn't. Now, his prime goal is to protect his lovely twin sister from the tragedies that are to struck her and teach his shitty family the meaning of abandonment. He's thrilled.