Both are about a career driven female lead who got transferred to the back office to do menial tasks but ends up revitalizing the team's functions and morale as they now view their job as critical and significant in supporting the "frontliners", since her arrival which eventually earns the respect of her colleagues. Both deals with bureaucratic and management issues. While Answer is about police organization, Proofreader is about the fashion industry.

Similar premise of an inexperienced guy falling in love with a beautiful woman who is completely out of his league, as he get his first taste of love and heartbreaks.

Although Densha Otoko is more comedic, Takane no Hana is more serious, due to the overall plot of her family's story of succession and inheritance.

A similar legal drama about an older male paralegal and a younger female prosecutor, working in a team of other paralegals and prosecutors who are rivals in the beginning but got closer together along the way as they set aside their differences to solve cases.

Both are legal dramas about a strongheaded female lawyer and a street smart male paralegal that solve numerous cases but struggles to keep the small law firm afloat while competing against a rival with a personal vendetta.

Both are crime dramas centering around a female lead detective managing a bunch of misfit detectives. Similar vibes and humor watching their comedic antics in solving crimes.

Both are investigative genre which features a strongheaded female lead who deals with cases and issues faced by women.

Both features a team up of an older and experienced with a younger and inexperienced. While Onna wa Sore o Yurusanai is about lawyers, Joshi Deka is about detectives.

Similar plot where a veteran lawyer quits her corporate job after getting into a work conflict with her superior, and work in a small law firm, alongside a rookie but passionate partner.

Two characters of opposing personalities team up together to solve small cases which turns out to be big and complicated, as they both learn from each other to be formidable together.

Both depicts the tale of the legendary and honorable Samurai Uesugi Kenshin.

While Tenchijin focus more on his successor Uesugi Kagekatsu, Heaven and Earth focus more on Uesugi Kenshin himself, from his rise to power to the iconic duel with Takeda Shingen.

Similar but opposite tale of time traveling.

In Nobunaga Concerto, the lead travels back in time to Sengoku.
In Samurai Sensei, the lead travels from Bakumatsu to modern day.

Both have perfect balance of comedy and seriousness, as the leads try to figure out how to fit in and adapt to the new timeline, while learning new things about life.

A similar tale of a young man who struggles through modern day life and finds himself transported back in time which changes his mindset for the better.

While Nobunaga Concerto is during Sengoku, Junihitoe wo Kita Akuma is during Heian. Both features a fearsome woman that leaves a big impression on the main lead.

Both are lighthearted dramas about a woman who gets entangled with two men from the past who got lost in modern Japan. While she try to make sense of what is going on, she gets pulled into their shenanigans which affects everyone around her.