Ikuo and Tatsuya are orphans. They live at Mahoroba’s house which is a child and family services home. At their elementary school, they see Teacher Yuko, who took good care of them like a real older sister, killed right in front of them. Ikuo and Tatsuya tell the police what they saw, but the case is covered by a police officer wearing a gold watch.
15 years later, Ikuo (Toma Ikuta) now works as a detective. He is a good person and his arrest rate is the highest at the police station. Meanwhile, using his handsome appearance and cleverness, Tatsuya (Shun Oguri) becomes a high ranking yakuza.
Detective Ikuo and Yakuza Tatsuya have a singular purpose, which is to find the man wearing the gold watch, dig out the truth and reveal the dark side of the police organization.
Hisashi Ieji (Takuya Kimura) works for a securities company. 5 years ago, Hisashi Ieji had an accident at the place where he was sent to work. Due to the accident, his recent memories have become blurred. He also doesn't have any feelings for his wife Megumi Ieji (Aya Ueto) or 4-year-old son. To him, its like his wife and son are wearing masks. Hisashi Ieji does have fond memories for his ex-wife and daughter. He divorced his ex-wife 5 years ago. To find out what happened to him for the past 5 years, Hisashi Ieji goes on a trip to find himself and he takes 10 mysterious keys.
Michio (Kyoko Fukada) is 30-years-old. She keeps looking for a job after her previous employer went bankrupt, but she is unable to find work. Michio still supports her younger boyfriend and her savings is almost gone. Then, Michio meets her ex-boss Ayumu (Dean Fujioka). She was scared of Ayumu when they worked together. Ayumu now runs a tearoom which his grandmother ran. Michio decides to work part-time at Ayumu's tearoom.
There, she various troubles everyday. Ayumu helps Michio, which allows her to see a different side of him that she never noticed before.
Ryo Saeba (Takaya Kamikawa) is a private detective and a sweeper who rids society of evil. He is also known as City Hunter. He works with partner Kaori Makimura. An accident leads to Kaori Makimura's death and her heart is transplanted to Xiang-Ying. Xiang-Ying then appears in front of Ryo Saeba.
Akagi Shigeru is a young, white-haired mahjong genius. One summer in 1965, he ends up facing off against Washizu Iwao, Japan’s King of Darkness who has amassed enormous fortune and power, at the request of his acquaintance, the rogue detective Yasuoka. As the observer, Ogi Takeshi, a leader of the henchmen of Inada-gumi watches over them, mahjong with special rules called Washizu Mahjong begins. It is a life or death struggle with Akagi’s fresh blood and Washizu’s entire fortune at stake.
Light Yagami (Masataka Kubota) is an ordinary university student. One day, he receives a death note which changes his life. The death note awakens his warped sense of justice and genius. He becomes murderer Kira and punishes criminals.
L (Kento Yamazaki) is a well known private detective. L appears in front of Light Yagami. L defines Kira as evil and decides to catch Kira. Then N (Mio Yuki), who has a beautiful appearance but dangerous existence, appears.
Yu Akahane (Nana Komatsu) moves to a dormitory room after her father's transfer at work. She and Haruto (Kento Nakajima) aka "Black Devil" have the worst meeting. Since then, Haruto treats her like his slave. The only person who is kind to her is Takumi (Yudai Chiba) aka "White Prince”.
Haruto orders Yu to go to her middle school reunion, but Yu, who doesn't want to remember her middle school days, refuses. At this time, Suzune (Kaho) appears. She is a childhood friend of both Haruto and Takumi. Due to her, the relationship between Yu, Haruto and Takumi changes.
In 2009, Yamato Narumi (Sota Fukushi) is a 3rd grade high school student in Nagasaki, Japan. Yamato and his friend Miku Odagiri (Kyoko Yoshine) find an old man, Akira Shoji (Teruyuki Kagawa), stabbed and lying in the street. The old man tells Yamato that his father is the criminal in the 300 million yen case. That night, Yamato’s father, Tetsuya (Toshiaki Karasawa) disappears and 3 days later his body is found drowned in Tokyo. Yamato and Miku find themselves caught in a whirlwind centered around the still unsolved stolen 300 million yen case from 1968.