Hee Ram and Ga In met in a general education class, Psychology of Love and Sex class. In this class, students have to perform a dating mission as a mock couple. A hard-working student Hee Ram and an easy-goer Ga In don't quite get along with each other from their first meeting.

Junichi is a scout recruiting girls for work in night clubs; but in contrast to what he does, he is actually a sentimental person at heart. Nanami, who is a music teacher at a junior high school, wishes that something would happen to change the course of her ordinary life. Being from a high-class family and having committed to an arranged marriage with a government official, she and the street smart Junichi are from two different worlds. Their initial meetings always ended in disdain for the other, but when Junichi helps her find some sheets of music precious to her, she begins to think that he could change her life. Although it goes against everything that her upbringing has taught her, Nanami decides to give him a chance.

Since the final scene, there are stories yet to be told. That being so, the gang has returned to complete the story.

The TLT is a covert international anti-monster unit established secretly to combat Space Beasts, mysterious monsters that are out to attack humans in the year 2009. One of the TLT's new recruits, Komon Kazuki, is attacked by one of them prior to reporting for duty. However, he is saved by a silver giant that he names "Ultraman". What no one knows is that the silver giant is an Ultraman, to be precise, Ultraman Nexus, ready to fight the Space Beasts to save the planet Earth.

Enomoto Kei is a security "otaku" working for a security firm, devoted to improving the securities system on a daily basis. He is not an easy person to familiarize oneself with, always collected and calm, unapproachable, a maniac in Physics, Science, Architecture and profound in other basic theoretical foundation. He is certain and proud of the fact that there is no key which he cannot unlock. One day, Kei is asked to help reveal a mystery behind a locked room murderer. While he lacks any interest in solving the mystery, he is inevitably intrigued by the term, "Closed Doors" and decides to take on the position. He works side by side with Aoto Junko and Serizawa Gou, who are lawyers working at a major law firm. Junko is pure and forward, acting upon her instincts while Serizawa is a prideful elitist who sees time as money, and therefore, will not take on any job that is unprofitable. Possessing a vast amount of knowledge and acute insightfulness, Kei is able to unlock the closed doors and unravel the secrets leading to the solution. Never before has there been a drama focused solely on closed doors. It's an all new original mystery that will keep you guessing every week

In Shang Hai during 1930, Zhou Jin finds out about her family history and discovers that her father passed away 10 years ago mysteriously. Hidden from the truth, Zhou Jin tries to find the answer and enters the mighty Shen family with her childhood friend, Su Zhi Wen. Accidentally, they find out that the underneath all the glimmer of the "Lady's House", there lies many dangers and secrets that threaten Zhou Jin's purpose.

The story, developed with the cooperation of the International Mathematical Olympiad in Japan, is set at a specialized math school, where Michishige and Tanaka both take on the roles of “suugaku joshi” (“math girls”). Naturally, the show will incorporate various mathematical functions and formulas into the story and dialogue.

Kazuki Sato (Dori Sakurada), a hater of math, is transferred to a new school. On the first day of his new school, he walks to school and spots a pretty girl named Nina Machida (Reina Tanaka). At school, his homeroom teacher takes him to a classroom. On the chalkboard is mathematical formulas. He is surprised. His homeroom teacher tells him that his new school specializes in mathematics. Kazuki Sato is stunned.

On the other hand, Kazuki Sato is happy to see many pretty girls in his new classroom. When he sits in his seat, he sees a girl climb through the window and into the classroom. The girl sits next to Kazuki Sato. The girl turns out to be Nina Machida, whom Kazuki spotted on his way to school.

During break, Nina Machida takes Kazuki School to the school cafeteria and tells him to buy bread whenever she asks. At this moment, Sayuri Tachikawa (Sayumi Michishige) and her two friends, who do not like Nina Machida, scheme to get Kazuki Sato and Nina Machida expelled from school.

Kazuki Sato walks around the school and sees a bunch of girls recite mathematical figures. He wonders to himself what they are doing. A girl then comes close to him and tells him that they are practicing to become the math president. Meanwhile, Nina Machida sits on a bench and a teacher sits next to her. Nina Machida tells her that she misses her older sister a lot. Her older sister went missing, right after she became the math president. Now, Nina Machida wants to become the math president...

A twist, where our lead girl is the mean girl.

Thae is a spoiled rich girl and very demanding to Pittiya who works at her father’s company. He also happens to be an adopted son, therefore lowly status in Thae’s eyes and worthy of bullying. She feels she can tell him to do anything and he must obey. Pitt on the other hand, despite inevitably obeying her orders, he doesn’t do so without a fight. He never gives in to her emotional, flighty ways, which pisses her off to no end. Pit gives in to her out of respect for his adopted father, but he would much rather dance attendance to Ravee, his girlfriend. Because of his girlfriend, Pittiya rejects the offer of marriage from Thae's father. Thae can't believe he refused her and plans her revenge. She tries to break up Pit's romance by pretending she and Pit have a closer relationship. But why all the hostility towards Pitt?