short Japanese dramas 12 episodes or less

Chiyo has a one night stand with Ryunosuke who is a carefree bachelor and winds up pregnant. Chiyo's father doesn't want them to get married. After much struggles and growing up, they finally accept each other and get married.

Shunsuke works part-time at a cafe owned by his uncle Takehiko. One night, a woman named Senka, who is dressed like a traditional oiran (high ranking courtesan), appears in front of him. Apparently, she just travelled across time from the Edo period to the present day and she looks completely lost. Shunsuke takes her to his uncle's house where he also stays. Senka stays at Takehiko's house and also begins to work part-time at his cafe..

The male lead is a university lecturer, who is an alien that has hidden his identity for the past 400 years, He falls in love with a spoiled popular actress.

Sakura is a nurse who met Doctor Kairi, several years ago and fell in love with him.  5 years later she meets him again, but he is totally different than what she imagined. He is a perfectionist and is unkind to the other doctors and nurses. Sakura works hard to receive recognition from him and eventually the doctor begins to notice her.

Inoue works part-time at a convenience storeand the other part of her day reviewing sweets online. One day at work, she is introduced to the chain’s CEO, Asaba, who, as it turns out, is familiar with Inoue’s online reviews. Asaba asks Inoue to develop new desserts to sell chain-wide and in the process they become sweet on each other.

The female lead kisses the male lead the first time she sees him and is drawn into a relationship with a man she knows nothing about.

Both female leads marry because it seems like she has no better choice. The male lead is trying very hard to make the marriage work sometimes with opposition from the female lead.

Hayame suddenly becomes penniless and homeless! Things couldn't get any worse, until she runs into rich high-school brat Issei, whom she had previously humiliated! Sparks fly as two worlds collide in this unlikely Cinderella story!  This series has a love square, Where 3 men love one girl. I won't say more to spoil it but I thought it was well done.

The male lead's mother is diagnosed with cancer and is worried about her son being alone after she dies. So her son wants to immediately get married for his mother's sake. 

The female lead caught her boyfriend cheating on her and decided she wanted to be married to just anyone because she wanted to escape her parents’ house and her current life. 

They decide to marry without knowing each other and only meeting each other onetime. they don't even know where each of them work

The female lead plays an innocent girl who asks the male lead on the third date to marry her. They start their marriage not really knowing each other and thus their life as newlyweds begins.