DAYS WITH MY STEPSISTER NOVEL SC (2025)

After his father remarries, Yuuta suddenly finds himself with a new stepsister: Saki, the greatest beauty at school. Neither of them is sure how to act around the other at first, but the two gradually grow more comfortable living together. Slowly, cautiously, patiently, two strangers become more. So begins an unlikely love story.

Yuuta Asamura is still figuring out how to interact with his new stepsister, Saki Ayase. But after finding they have more in common than expected, the two reach a comfortable equilibrium. Things start to get out of whack, however, when Saki fails one of her exams and asks for Yuuta's help. Then Yuuta's attractive college-age coworker, Shiori, invites him out on a date, and Saki finds a strange new emotion welling up in her heart... Just what is this feeling?

It's Yuuta's and Saki's first summer vacation as stepsiblings, and they'll be working at the same bookstore! As her senior coworker, Yuuta begins to see a side of Saki he hadn't noticed before. But when Shiori works a shift with her, she makes a dark observation-if Saki doesn't ease up and start relying on others, sooner or later she's going to destroy herself. If he wants to help, Yuuta will have to make a decision. Should he betray his own rules and interfere in his stepsister's life?

When Saki called Yuuta "Big Brother," it looked to everyone else like their relationship had taken a big step forward. In reality, it was more like a line drawn in the sand. As their hidden feelings make time spent together increasingly awkward, the two of them explore new relationships and weigh their priorities. Are some things worth holding onto despite the sacrifice, or is it time to let go and move on?

Yuuta and Saki begin a secret double life and a relationship they can't name-they're still siblings, but they're also teens in love. Going on their first date, getting into fashion, attending a friend's birthday party, celebrating Halloween. They've lived their lives without expecting anything from others, but as they spend more and more time together, those feelings begin to change. And gradually, the people around them start to notice...

Infected by the magic of Halloween night, Yuuta and Saki sought out each other's warmth. Though it might look the same to those around them, their relationship has undergone a definite change. As they pass their first winter together, including its various celebrations, they struggle to balance communication and the joy of surprise. How can they make each other happy, and where are they headed? Are marriage and children in their future, or something else entirely?