Recommendations

Takumi-kun Series (1-5) are BL movies with a comparable mood to them. Manly because they have drama, but are mostly positive and sweet. (With the exception of some tragedy in the 2nd Movie, if I remember right). Both have the school setting. Even though you will have to be prepared. Seven Days has the better acting. However, relationship wise the Takumi-kun Series has more depth and action going on.

in both dramas, the main girl-lead passes the test to work in the palace. The male-leads both hate the girl-leads but fall in love with them slowly.
both have really good stories and lovely music.^^

Both female characters have non functional relationships which sent them to cheat their partners.

same love story happening inside the company. a love triangle dilemma.

These dramas resemble one another because they have the same feel. It is a rom-com with some melodrama elements, but it has a lot of humor. The leads are also both very naive; we also have big company background and family problems.

While Sailor Zombie stars AKB48, if you're looking for more female idol filled dramas 'Innocent Lilies' and 'Innocent Lilies 2' might be for you. The plot are both rather dark, and end with a similar feeling.

The first season of the drama Thumping Spike 2. The drama's main cast is different.

This drama is a Historical drama and it's also starring Lee Joon-gi as the 4th Prince Wang So.

Both are train themed shows that are rather lighthearted and both are by the same writer.

- Both high school dramas.
- SUFBB main characters are part of a rock band. SGG main characters are part of a cheerleading squad.
- Both have rivalry between two groups.
- Cute romance for main and side characters.

in both dramas, both female leads have to keep their identity a secret and both girls are surrounded by boys that they learn to cope with

Because both series have similars storyline, the confusion between a woman wear as man, a very good man trying to be king and fix the world. The difference is basic about the second characters, which are more kind and nice in Love in the moonlight than in Shine or Go Crazy.

These were like hand-in-hand productions. They are so similar that the ending is kinda obvious though..
-Manga adaptions
-Boy x Boy relationship
-Work-place Environment
-Sickeningly sweet
-Insecure Uke

Gen Urobuchi has stated that Black was a huge influence on Gaim - specifically, the duels between Black and Shadow Moon were what influenced the show's writing. Plus, Kouta is very similar to Kotaro, and Shadow Moon has a counterpart in this show as well (I cannot say who as that would spoil things).