Tanno Tomofumi, diagnosed with early stage Alzheimer's at the age of 39, Orange Lamp followed a married couple's nine years after realizing that life has no reason to surrender to an disease.
This is a story of three generations of women in the Mikuriya family, seriously thinking about "What kind of life do I want to lead?" and overcoming their problems by saving money. Mikuriya Miho is the second daughter of the family and has just started living alone after finding a job with a decent salary. Miho has been dreaming of becoming a working adult with a wonderful boyfriend, but an event causes her to rethink her life.
40-year-old Usui Arata had worked as a salesperson for her dream company but right before her marriage, she is betrayed by her fiancée. Not only is her engagement broken off, she is demoted to work at the logistics warehouse in the name of restructuring. Arata’s future is bleak. She has no dream, savings or boyfriend and wonders whether her life will end just like this? This day is her 40th birthday but no one celebrates it with her. The only thing she receives are e-mails from online shopping sites. On her way to the workplace from the company dormitory on a typical dull morning, Arata notices an elderly woman crouching by the side of the road. There is no one in this corner of the city to help her. It feels as if she is seeing herself 40 years later and she instinctively extends a hand to the woman.
One day, Ezawa Jun, who has trouble with work and in love, gets a ryukin from a goldfish scooping game at a festival. However, she is actually a beautiful girl and she suddenly turns into a human form and appears in front of Jun. Called Ryu, she is looking for the legendary black ranchu and asks Jun for his help. The two strangers begin living together and growing closer. Their fate goes in an unexpected direction.