Momoko, a married woman in a mature relationship with her husband, has a son, Taka, who is about to become a college student. Despite three years passing, she still struggles to bridge the gap with Taka, maintaining a formal distance. One day, she receives a package addressed to Taka. Concerned by the frequent deliveries from the same company lately, Momoko decides to peek inside the package while Taka is out. To her surprise, she finds sexy swimwear inside. Despite thinking how scandalous it is, Momoko, overcome by temptation, puts on the swimsuit herself... .
