Do S Na Oniichan To No Atarashii Koi No Hajimekata Oshiete KudasaiドSなお義兄ちゃんとの新しい恋のはじめ方教えてくださいっ！; 家の中のSな事; 1 新しい家族と一つ屋根の下; Ie no Naka no S na Koto; Sadist in the House

Shiori's dad remarries and she couldn't be happier. Not only has she gained a new mom, but a hot, older, yet sadistic brother as well?! Note: The manga was previously named as Ie no Naka no S na Koto.