Narumi is on bad terms with her husband Shinji when one day, Shinji goes missing. He comes back a couple of days later, but seems like a totally different person, and is now gentle and tender. He goes for a walk every day. Meanwhile, Journalist Sakurai covers the story of a family that was brutally murdered, when an unexplained phenomenon takes place. Shinji Kase tells his wife that he came to Earth to invade.

A detective probes the brutal murder of a woman in a red light district while a housewife hides her double life as a prostitute from her husband.

Ryûhei Sasaki (Teruyuki Kagawa) is keeping a secret from his wife, Megumi (Kyôko Koizumi), and his two teenage sons. Even though he leaves the house every day, he's not really going to work. He's going to an employment office. He recently lost his job due to outsourcing, but is determined to find another position, all while supporting an old friend who is also out of work. But when Megumi accidentally finds out Ryûhei's secret and doesn't tell him, her trust in him, and their marriage, suffers.

The story takes place after the TV drama series Ossan's Love (2018). It's been a year since Haruta and Maki pledged their undying love. Haruta has now come back and receives a warm welcome from familiar faces, his boss Musashi Kurosawa and other colleagues. Justice Yamada, a recruit who has been recently assigned to this branch, welcomes him too. One day, completely out of the blue, the headquarter-based project team "Genius 7" shows up at the Second Sales Branch. Project leader Jin Mamiana orders the Sales team to support them in their big project. Maki, who had been transferred and works now at the head office, is among the project team members with Mamiana. Haruta and Maki grow apart, and Haruta teams up with Justice. Then Kurosawa gets involved in an accident and loses his memory, but the loss of his memory is selective and he has forgotten only Haruta. However, when Kurosawa sees Haruta, he falls in love again.. Hilarious and heartwarming, the final battle of Ossan's Love begins.