(W) Ghost Mikawa (A) Yumika Kanade, Hiten After his father's remarriage, high school student Yuuta suddenly finds himself 'stepsiblings' with his classmate Saki. However, unlike the plain and simple Yuuta, his new younger sister has an over-the-top sense of style and is known as the hottest girl in the grade! Due to past trauma, Yuuta isn't great at talking to women, and at first is perplexed by this new family member who seems to be his complete opposite...but as the two settle into a shared lifestyle, could their relationship blossom into something more?!

(W) Ghost Mikawa (A) Yumika Kanade, Hiten 'I can't fall in love with her. After all, the two of us are siblings.'?It's Yuuta and Saki's first summer break as stepsiblings. Now that Saki has started part-timing at the bookstore where Yuuta works, they inevitably end up spending more time with each other. After being around his little sister a lot more than usual, a forbidden emotion starts to well up inside Yuuta's heart...

(W) Ghost Mikawa (A) Yumika Kanade, Hiten Yuuta and Saki have decided to hide their feelings for each other away, choosing instead to live as brother and sister. But suppressing their emotions isn't easy, and even as Yuuta tries to turn his attention to other women, it only makes him realize how special Saki is to him. And Saki, for her part, isn't faring much better?