Gimai Seikatsu

After his father's remarriage, Asamura Yuuta finds himself with a new stepsister, Ayase Saki, who also happens to be the most beautiful girl in their school. Despite the unexpected turn of events, the two agree to maintain a respectful distance, avoiding being too close or too confrontational. Both have learned valuable lessons from their parents' past relationships and aim to coexist peacefully under one roof.

Saki, who has always been independent for her family's sake, struggles to rely on others, while Yuuta is unsure how to approach their new relationship. As they navigate their new life together, they gradually discover the comfort and support of living with each other. What starts as a distant and formal arrangement slowly evolves into a deeper bond, hinting at the possibility of love in the future.