Konomi ja Nai kedo - Season 1

Siblings Ritsuki and Kyouya share a contentious relationship, frequently arguing even in front of friends. After rushing home in the rain, Ritsuki collides with Kyouya at the entrance. Her anger shifts when she observes his shirtless, wet, and muscular physique, which she finds appealing. Attempting to leave quickly, she instead bumps into him again and sprains her leg. Kyouya brings a compress and bandage to her room, marking his first visit in years and making him conscious of their opposite sexes. He intends to leave to avoid complications, but Ritsuki insists he massage her leg. Feeling responsible for her injury, he reluctantly agrees. While performing the massage, Kyouya becomes aware that his sister's body aligns with his preferences.