Running around town in a wedding dress
Hirosue in Oyaji, Yamaguchi in Long Vacation, Matsushima in Nadeshiko.
I can already think of these from the top of my head.
When the junior stabs the main character in the final episode
When the likes of Chizuru Ikewaki or Miki Mizuno, the sub-heroine of the story, gets pregnant
When they try to force a happy ending
A beloved someone only has half a year left to live
Copy My Boss, My Hero
The main character is a crazy teacher
The existence of characters shrouded in mystery
Low ratings despite being good
A main character who works part time for a food company, on the country-style balcony of his/her home listening to the grandma and grandpa's life story -- mostly in Yoshikazu Okada's works
A wild and crazy teacher is coming to town! Yep, in dramas with Yukawa's script.
Izumi Kizara's works:
Characters say what they want even if it's unrelated to the story, and that's it.
NTV recently have been showing a lot of dramas with slightly offbeat main characters.
Joou no kyoushitsu
Haken no hinkaku
Kaseifu no Mita
There are a lot more cases when a pure and innocent type of actress plays the role of someone who gets pregnant instead of the flashy ones.
A surprisingly unimpressive final episode
Everyone locks themselves up in a room
A supporting character who's secretly in love with the main character
The episode before the finale is actually the better one
Labor pains -- it's not like they're continuous, but the women will keep screaming all the time.
Morning sickness -- it doesn't come suddenly like they do in dramas, but people will normally feel nauseous the whole time. In dramas, they suddenly go "Ugh!", run to the bathroom, and say hello to the baby in their tummy.
Shutting a talkative woman up by kissing her lips
When a detective, doctor, or teacher is the main character of the drama, no matter how horrible the ratings may be that it's good enough to get cancelled, they would put twists at the end like moving to a new workplace, or shuffle positions, shuffle classes, etc., and make it seem like there will be a sequel coming up.
Drama ○× Gakuen that got an average of 4.3%
Former student A: "That ○×, he's probably causing trouble again over at that school."
Former student B: "Yeah, it's that ○× we're talking about after all."
...Scene shifts to Teacher ○×'s new school which looks totally like a delinquent school
Teacher ○×: "So this is my new school. Wait for me, my students~!"
...Theme song fades in. Then staff roll with all the highlights up to the ending.
When someone reads a letter, the voice and the images shift to the person who wrote it.
This happened a lot in dramas back in the day.
Those who are being held captive for numerous days after being kidnapped have their peeing scenes cut
Their enemies at the beginning end up becoming their allies later on
Characters bump into each other a lot in town
No matter how messed up a story is, everything gets resolved in a few minutes during the finale.
And the drama ends with everyone being nice guys.
Students lock themselves up in classrooms a lot in school dramas
They try to get more ratings by casting good-looking kids (supporting role)
Every single cast member is shown one by one and has a close-up at the end.
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