It's a holiday with nothing to do. Hiroki is planning to spend the whole day lounging around when his mother's best friend, Miki, appears in front of him. Hiroki falls in love at first sight as she smiles at him with her seductive beauty. Hiroki is not only attracted to her, but also distracted by her massive breasts that are about to burst through her clothes at any moment, and is unable to look her in the eye. Hiroki gives in to his desire and peeks at her bathing. However, instead of getting scolded, she gently gives him instructions...