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Ji Sub is coming back home after an unsuccessful audition. Suddenly, a sound makes him stop his car. When he opens his trunk, he discovers young woman, Yeon Hee, who doesn't remember anything about herself. Who is that girl and why did she appeared in front of Ji Sub?

It is April at Kokubunkan Public High School which is known for being good at both studies and sports. Aoyagi Haruka, the rookie form teacher of Class 3D, swells with hope. However, the assistant form teacher is Takakura Yuko, the biology teacher with a poor reputation in school. Furthermore, the transfer student Toda Toshio suddenly accuses the class prefect Mochizuki Ryohei and others of bad deeds. There is a lot to sort out for the new school term. One day, Class 3D’s Yamagishi Rio is instructed by her boyfriend, Tatsuya, to collect the email addresses of her friends. Tatsuya attends a first rate university and has also passed the bar exam. He belongs to the “winners”, but is in truth a peddler who sells unregulated herbs. In order to keep her relationship with Tatsuya going, Rio caters to his demands even though she knows is it wrong. Before long, there is a spam email that starts the rumour of Rio offering email addresses and encouraging unregulated herbs. An inspection of Rio’s bag is carried out without warning. Rio seeks Haruka’s help and Haruka promises to keep it a secret from the school. However, Yuko points out that Rio is a mere tool of the peddler. In addition, there is a call about the collapse of the students of Class 3D after smoking the unregulated herbs. In an attempt to save an embattled Rio, Haruka asks Yuko for help. But Yuko coldly says that she will save Rio in exchange for Haruka’s first paycheck. Yuko, the classics teacher Uchida Sumire and art teacher Fujii Aya wear different faces from daytime. They are “black teachers” who solve problems in return for large sums of money.

Ishibashi Naoto is a successful reporter who has just gotten married to his girlfriend, Saki, whom he met one month earlier. However, as Naoto begins to live a new life as a married man, strange things start to happen. Saki disappears without a trace and as Naoto begins searching for her, he finds out Saki's identity doesn't exist. When Naoto starts to dig deeper into the mystery, he begins to receive anonymous threats. Frustrated, Naoto meets a Yoshino Mariko, detective who thinks she might hold the answers to Naoto's questions.

Shinobu Takeuchi becomes a homeroom teacher at Ooki Elemntary School in Osaka, Japan. Shinobu loves mystery novels and can't stand things when it doesn't turn out right. Shinobu with three of her students then attempts to solve a difficult cases that even detectives can't solve.

Tomonaga Akiyuki (Motoki Masahiro) and his wife Yu (Seto Asaka) have been married seven years. Akiyuki is a graphic designer, and is quite happy in his work and private life. One day, he attends the wedding of his younger half-brother Ichinose Ryo (Kaname Jun). However, Ryo runs off with a young woman who appears at the wedding, leaving the bride Jumonji Azusa (Okina Megumi) at the altar. Akiyuki bows his head and apologizes to Jumonji, and this is the prelude to a growing intimacy between them. Is it love, or is Jumonji after revenge? And what do Yu and Ryo think as they become aware of this relationship? Akiyuki and Yu, it seems, are headed for divorce. Further complications arise for Akiyuki and Yu when Akiyuki’s close friend Shunsuke (Sasaki Kuranosuke) and lawyer Reiko (Hada Michiko), advising on divorce, get involved. With a theme of loneliness, this deftly woven drama portrays adult love affairs that leave the viewer guessing who will end up with whom.

A story of 5 friends in high school. A mutual crush, a one-sided love, and a rough patch for sweethearts. All of this happens as exams come up, will they be able to confess their love?