Domestic Girlfriend, similar to Days with My Stepsister, talks about the scope of romantic relationships among stepsiblings with a love triangle between Natsuo & his stepsisters
Kiss x Sis is a romantic comedy series about the unconventional relationships between a boy and his two step-sisters
A Sister's All You Need would be a good choice as it centres around sibling relationships, exploring the complexities and emotional nuances that come with living together
Onegai☆Twins is a story about Maiku Kamishiro who ends up living together with two girls, who claim to be his stepsisters until they can determine who is truly related by blood
Citrus, a Yuri series that follows the relationship between two step-sisters with contrasting personalities
Love is Indivisible by Twins follows a complicated love triangle between Nozomu Futami and the Ichijo Twins, two of Nozomu's childhood friends who harbor romantic feelings for him
Oreimo follows Kyosuke Kosaka and his seemingly flawless little sister who behind her perfect student persona hides an otaku obsessed with erotic games with big brother & little sister fetishes