On a night when their parents are away, Mio feels her heart race more than usual as she finds herself alone with her older brother. She's prepared her first home-cooked meal, shyly devoting herself to him. With her naturally affectionate personality, she repeatedly teases her brother with naughty requests, her heart fluttering at the thought of their secret time together. Embraced by her kind and tender brother, Mio enjoys her first intimate experience. Their bond deepens as they share a night filled with genuine pleasure and connection.