Kokou no Hana to Yobareru Eikoku Bishoujo, Gimai ni Nattara Bukiyou ni Amaete Kita

A high school student named Kento begins living with his new stepsister, a British classmate named Sophia Frost. Known for her reserved nature and striking appearance, she is often referred to as the "Solitary Flower." Initially distant and cold, Sophia gradually shows subtle signs of interest in Kento, such as asking for small gestures of attention and expressing discomfort with her own feelings. As they share a home, her attempts to hide her growing affection become increasingly evident, creating a series of awkward yet endearing interactions.