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！

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?!