I'm Mita, Your Housekeeper.

Mita (Nanako Matsushima) is a perfect but emotionless housekeeper. She's sent to the Asuda family, where father Keiichi and his four children are grieving the mother's recent death. While Mita restores order to the home, Aunt Urara suggests a party for the youngest, Kii. When asked what she wants, Kii makes a heartbreaking request: "I want to see my mother." ©NIPPON TV

Keiichi (Hiroki Hasegawa) confesses to Mita that his wife committed suicide because of him, begging her to keep it secret. Meanwhile, Kaito is bullied at school. When Mita attacks the bully Furuta at Kaito's request, the bullying worsens. Desperate, Kaito asks Mita to kill his tormentor. "Understood," she replies, heading toward Furuta. Is she actually going to commit murder? ©NIPPON TV

Learning the truth about her mother's death, Yui (Shiori Kutsuna) lashes out at her father and gets into a fight at school. Meanwhile, her siblings follow the mysterious Mita (Nanako Matsushima) on her day off to an unexpected location. Still furious, Yui orders Mita to expose her father's affair. Mita obeys, heading to his office to distribute flyers revealing the whole truth. ©NIPPON TV

The children leave home after learning the truth, leaving a conflicted Keiichi behind. When he pours his heart out to the stoic Mita (Nanako Matsushima), her lack of empathy leads him to fire her. Suddenly, Mita calls: "I have kidnapped Kii. Her life is at risk unless you meet my demands." What is Mita's true motive behind this shocking ultimatum? ©NIPPON TV

With their father gone, eldest son Kakeru tries to lead the household but is ignored. Frustrated, he turns violent at school and lashes out in the streets. He even gives Mita (Nanako Matsushima) an exploitative order. Mita replies, "Shall I kiss you first, or should I strip?" Finally, Sho demands she "wreck the neighbor's house." Mita stands before the house, ready to obey. ©NIPPON TV

Yui (Shiori Kutsuna) is pressured by her brothers and grandfather to make a family decision, but she lashes out in frustration. Even Mita (Nanako Matsushima) remains cold and indifferent. Betrayed by her boyfriend and crushed by despair, Yui begs Mita to kill her. "Understood," Mita replies, raising a blade toward Yui. Will Mita actually follow through? ©NIPPON TV

Mita (Nanako Matsushima) confesses to "killing her husband and child" but refuses to elaborate. When Kii (Miyu Honda) lands the lead in her school play, Yui asks Mita to tell Keiichi to attend and prove his love. However, a fearful Keiichi asks Mita to "cancel the play" instead. On the day of the show, Mita walks onto the stage clutching a metal bat... ©NIPPON TV

The children desperately plead with Mita (Nanako Matsushima) to open her heart. When Kii (Miyu Honda) offers her a sweet, Mita eats it slowly, savoring the taste. Finally, she begins to speak: "And so, the future vanished from my life." Like a broken dam, her emotions pour out. Why did her husband and son die? The horrific past behind her lost smile is finally revealed. ©NIPPON TV

Mita (Nanako Matsushima) leaves the Asuda home and begins working for the neighbors. After discovering her husband's affair, the neighbor Mariko hysterically orders Mita to burn the house down with the family inside. Mita douses the room in kerosene. When Mariko panics and screams, "You should just die instead," Mita pours the kerosene over herself and prepares to strike a match... ©NIPPON TV

Back at the Asuda home, Mita (Nanako Matsushima) begins seeing visions of her late husband and son. When young Kii (Miyu Honda) burns herself while helping in the kitchen, Mita feels cursed to bring misery to everyone she loves. Haunted by this guilt, she heads to an amusement park to confront the ghosts of her past once and for all. ©NIPPON TV

Mita (Nanako Matsushima) becomes the Asuda family's "mother". Though the children are initially happy, Mita's strange behavior creates tension, especially after Keiichi collapses and is hospitalized. The children begin to suspect she is trying to take over the house. Meanwhile, Urara decides to marry. What is Mita's true intent? And will she ever show a smile? ©NIPPON TV