The sister is trying to get more love from her brother while her brother said in the last scene "I will try going out with (I cant translate this adj.) girl" then the sister said "isn't that good" to her brother... next panel,she's crying... I can't say the brother is evil because of the public moral... this is how the society is and this is the way it should end... but still..sad.Maruta is really know how to delive the pain of incest in to the story but actually... the one who has sister shoudn't be affect by love or romance interest with their sister or brother...thinking about it make me sick in real life because I never like my sister as woman and I can't... it's disgusting.
It's good manga with bitter end and great art and I recomment to anyone who love the art and sad story.