Haruka, a teacher, comes to her nephew Shota's house in Tokyo for training. Shota innocently pretends to play with Haruka, touching her big H-cup breasts with a stethoscope as a doctor, and other naughty pranks. Haruka is also turned on by Shota's exciting pranks, shaking her big breasts, moving her hips vigorously, and starting a very intense and naughty SEX with her nephew Shota.