Fuka, a 40-something busty mom living in Tokyo, is having a day off tomorrow and is relaxing alone having a drink while watching TV. Then her son Haruto comes over and asks - "Can I have a drink too?" The mother-son duo starts drinking together! However, Fuka soon gets drunk and falls asleep. Haruto is aroused by the sight of his mother's plump body as she sleeps soundly... Taking advantage of her sleeping mother, he flips up Fuka's underwear. Her breasts, which he hasn't seen in years, are as impressive as ever! Just as he reaches for his smartphone saying - "Let's take a picture, just one..." Fuka wakes up and says - "Hey!" Haruto is in a desperate situation... but the next thing Fuka says is something he never expected...