Izumi Takeda, a music student striving to become a pianist, has dedicated herself to piano every day. A virgin with no prior experience with men, she was told by her professor that her performance lacked depth. Wanting to improve her expressiveness, she decided to broaden her life experiences—starting with losing her virginity. Having never been touched by a man before, she was filled with nervousness and anxiety, but guided gently by her partner, she gradually experienced firsts like kissing and blowjob. Her first sex was tense and painful, yet she became so captivated that she lost herself in the sensation, successfully completing her transition from virginity. This film captures her pure heart, as well as the fear and joy surrounding her first intimate experience.