Takashi and his wife Kanon, in their second year of marriage, both want children. They have been practicing "conception activities" where Takashi abstains for a month to produce healthy sperm just before Kanon's most fertile days. Meanwhile, Kanon's sister Megumi, a flight attendant who travels frequently, has had difficulty conceiving with her husband. Desperate to have a child before her sister, Megumi takes advantage of the couple's planned conception dates to tempt Takashi, effectively depleting the carefully stored sperm.
