PS:   this is for my Korean friend XD. She said only JP drama she didnt drop - Mr. Brain. 

So one that is a rom/com but without the high school element or set primarily in a high school? Well then my list of movies will have to be:

Beyond the Memories - based on a manga
Dakishimetia: Shinjitsu no Monogatari - this one is based on a true story which might make it more melodramatic than a rom/com
Clover - based on a manga
The Kodai Family - based on a manga
April Fools - this one is more of a comedy than a romance since there are multiple stories that intertwine with one another but there is still romance
Kanojo wa Uso wo Aishisugiteru - The Liar and His Lover (based on a manga and there is even a Korean drama too)
The 100th Love with You
Train Man: Densha Otoko
Vampire in Love

My top 5 (in descending order, #1 being my favorite j-drama rom-com non-high school)

  1. Love Shuffle
  2. Suki na Hito ga Iru Koto
  3. Last Cinderella
  4. Kimi Wa Petto
  5. Kuragehime

Here are some Japanese romcoms not set in high school: 

 Julie_Jules:

So one that is a rom/com but without the high school element or set primarily in a high school? Well then my list of movies will have to be:

Beyond the Memories - based on a manga
Dakishimetia: Shinjitsu no Monogatari - this one is based on a true story which might make it more melodramatic than a rom/com
Clover - based on a manga
The Kodai Family - based on a manga
April Fools - this one is more of a comedy than a romance since there are multiple stories that intertwine with one another but there is still romance
Kanojo wa Uso wo Aishisugiteru - The Liar and His Lover (based on a manga and there is even a Korean drama too)
The 100th Love with You
Train Man: Densha Otoko
Vampire in Love

Non-High School. 

Thanks for the recommendations

 Hayley Ramiza:

My top 5 (in descending order, #1 being my favorite j-drama rom-com non-high school)

  1. Love Shuffle
  2. Suki na Hito ga Iru Koto
  3. Last Cinderella
  4. Kimi Wa Petto
  5. Kuragehime

Thankyou. 

 Hanna:

Here are some Japanese romcoms not set in high school: 

Thankyou. 

  • Initiation Love
  • April Fools
  • Ossan's Love
  • Tomorrow I Will Date with Yesterday's You

Realized going through what I have watched, most of my rom/coms are in high school...

My rainy day has a high school back drop, but they talk about bullying at school. However this aspect is not connected to the romance. Anyway, it’s a nice romantic movie if you give it a try.


Other than that, clover is a nice Japanese movie that is based on a manga :)

The Liar and his lover (JMovie) - The main female lead is a high school girl but it's not set in a high school. There's not much comedy but it's a really nice romance movie.

My Darling is a Foreigner (JMovie) - Funny. I liked it  a lot.


If she liked Mr. Brain a lot. Maybe she could try out some of the other countless dramas Kimura Takuya starred in?! Like Pride, Love Generation, Engine, HERO or Long Vacation are great ones.

I just realized I only recommended dramas even though you asked for movies! It's cause I read "the only drama she didn't drop" in your first message and got a bit mixed up!! whoops!

Here are some romcom MOVIES not set in high school 

  • Tori Girl (Highly recommend!)
  • Paradise Kiss
  • The Kodai Family

I could suggest : 

- Blindly in love

- Miracle : Devil Claus' Love and Magic

- Poison Berry in my brain

well... in fact I found it hard to find romance/ rom/com dramas not set in high school.

Ever green Love

Clover

Paradise Kiss

Though I'm a little bit confused since you said the only thing she didn't drop is Mr. Brain and that it's not a rom-com. So if she want to try other genre I'll recommend: G@me or The magic Hour

It's not a movie but Unnatural would be something similar to Mr.Brain :)

Romance

✔️ Evergreen Love 

✔️ Signal (2012) 

✔️ Last Cinderella (TV show) 


Crime/Medical (mostly TV shows) 


✔️ Galileo ( TV and movies) 

✔️ Painless:  Eyes for Signs 

✔️ Code Blue 

✔️ ST: Scientific Task Force 

✔️ Miss Sherlock