The only reason this anime doesn't have a higher rating is because the audience today is only focused on weak boring animes that are centered about slice of life , "comedy" , romance and high school life , this anime is simply amazing , it has it downsides , it didn't receive enough fundings in my opinion so , some parts of the animation seem to be CG , the sound as well , it uses some cheaply made sounds . Now about the good part , the story is mind blowing , it has action , intrigues , adventure , drama and romance , the story itself resembles to Kimetsu no Yaiba , 2 siblings trying to survive the harsh world , and also resembles Akame ga Kill , the oppressed form a rebel army to fight the ever expanding Empire . The characters also are very interesting , the bigger sister is kind and carrying and sweet , and tries her best to offer her little sister a normal life , her little sister is also kind but a bit jealous of the bigger sister because she's doing everything .
All I got to say , this anime is worth watching , very interesting , intriguing , full of action and has a solid backstory to it , it might feel a bit rushed , but my only guess it's because the lack of fundings , it doesn't have a high rating because it is not your usual Japanese anime , where the MC is a random guy who gets 10 girls falling crazy in love with him and then the story evolves about their love life , no , it is an intriguing action/fantasy/drama anime . 10/10