The lives of three people intersect on a late bus ride that's hijacked by a suicidal political flunky. Shingo is a miserable young desk cop bucking for homicide division. Tetsu is a restroom cleaning attendant who has a mentally ill father and a penchant for mischief. And Saki is a petulant druggist/chemist who was born without an eye and keeps her disfigurement hidden behind shades. Months after the hijacking, the trio lives re-intertwine as they playfully seek revenge for their unhappy lives, until the games become deadly serious.

Magazine reporter TANAKA is granted request to investigate a year old murder case gone cold, where a "perfect" family - a successful businessman, his beautiful wife and adorable child - were brutally murdered. Tanaka interviews acquaintances of the dead but gradually finds out that the family was not exactly ideal as believed, as stories of their true nature unfold. Equally disturbing are the interviewees themselves, each letting loose their own hidden nature. Meanwhile Tanaka himself is burdened when his younger sister Mitsuko is arrested for child abuse. GUKOROKU is a haunting and intense tale of the demons we face every day - inside and out.

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.