Watashi no Kaseifu Nagisa-san - Season 1

Twenty-eight-year-old Mei Aihara is a single working woman with no time or talent for housework and romance. But when she is forced by her sister to hire Nagisa Shigino, a middle-aged male housekeeper, hilarity ensues.

To her surprise, Mei discovers that her next-door neighbor Yuta works for a rival pharmaceutical company. To make matters worse, her colleague Kaoru arranges for Mei and Yuta to attend a matchmaking dinner together. On top of that, Mei's mother suddenly drops by to visit and Mei has to scurry to hide the fact that she has a male housekeeper!

Mei's mother returns home early to discover Mei and her housekeeper, Nagisa-san, together. Mei confesses that she takes after her mother in being terrible at housework. To Mei's surprise, her mother tells her that she is confident Mei can do anything if she puts her mind to it, and Mei becomes determined to prove her mother right.

Mei tries to stop Yuta from finding out she lives next door to him but he discovers the truth. Then, when asked if there's a man living with her, she lies and says that Nagisa-san is her father, not wanting Yuta to know she has a live-in housekeeper. Meanwhile, Kikunosuke, a doctor, starts pursuing her. Mei finally agrees to a date provided it's with a group of people. But then who should turn up but Yuta and one of Mei's female colleagues, Kaoru!

Mei returns home one evening to find Nagisa-san giving a cooking lesson to Misato, Mei's mother. Misato explains that she wants to surprise Mei's father on his sixtieth birthday with a home-cooked meal. Later, Mei consults Nagisa-san about how to use the occasion to reconcile her mother and her younger sister, Yui, who ran away from home three years ago. Meanwhile, Mei notices that Yuta is hiding something from her, even as he seems to be increasingly attracted to her…

Mei becomes curious about Nagisa-san's past. But her housekeeper remains tightlipped about anything to do with his private life, which remains shrouded in mystery. After all other means fail, Mei decides to follow him after he leaves her house to see where he goes, and she discovers a side of Nagisa-san couldn't have imagined. Meanwhile, Yuta begins to have nagging doubts about whether Nagisa-san is really Mei's father…

Nagisa-san becomes visibly troubled after seeing a woman at Mei's workplace and starts having accidents in the kitchen and other mishaps. Concerned that something is bothering him, Mei finally gets Nagisa-san to open up about his secret past. Meanwhile, Mei and Yuta, aware of their strong feelings for each another, have a series of awkward encounters. Then, frustrated at not being able to take their relationship to the next level, Yuta does something drastic and unexpected…

Yuta becomes convinced that Nagisa-san isn't really Mei's father when he witnesses them sharing an unguarded moment. Mei realizes that it might be time to reveal the secret she's been keeping from Yuta all this time. Meanwhile, Nagisa-san is taken aback when Mei's sister, Yui, tells him that he might have to stop working for Mei.

Mei is devastated to learn that Nagisa-san's housekeeping contract is ending. She implores him to stay with her for just four more days as what she calls a "trial marriage." Nagisa-san is taken aback but accepts her proposal with mixed feelings. Everything seems to be going fine until a crisis occurs at Mei's workplace. While desperately trying to fix the problem, she returns home one day to discover that Nagisa-san has vanished! Can Mei find a way to mend both her broken heart and her relationship with Nagisa-san?