The young couple Takashi and Kannon have been married for half a year, they always wanted to have a child but Kannon cannot because she has a rare condition. Coincidentally, Megumi - a flight attendant and Kannon's sister, also wants to have a baby while the two couples cannot do it together regularly due to work circumstances.JUFE-143 My sister-in-law is a flight attendant The story begins when Megumi visits her sister's house, after learning that Takashi is saving a large amount of sperm for his wife, she seduces her brother-in-law to help her because that day she is ovulating. Despite continuous refusals and advice that her actions are completely wrong, she does not care, instead aggressively fondling him and even sexually assaulting him when her sister is not paying attention. This will continue to happen in the coming month's ovulation days if this promiscuous sister has not become pregnant.
