Four beginner girls, including Mai, Mizuki, Hono, and Emi, attend a Pilates class taught by their male friends. After the first half of the class and a shower, they enjoy some light food and alcohol, leading to a more relaxed atmosphere. The class resumes with two pairs, but the erotic mood takes over, and they have wild sex in their Pilates outfits, even swapping partners midway. All performers are adults over the age of 19.