Kazuko Yamase (Aoi Morikawa) is a 23-year-old, broken-hearted freeter. One day, she sees a knitted teddy bear that really appeals to her. She decides to buy it. Later, the knitted teddy bear suddenly speaks! Within the teddy bear, Yasuo Amano's (Sho Aikawa) spirit lives. He is the person who knitted the teddy bear and he was also detective. Kazuko then becomes involved in a case with Yasuo and helps to solve the case.
No matter how hard he thinks about it, Todoin Seiya cannot figure out why he doesn’t have a girlfriend in his 16 year lifespan. Physically attractive, naturally smart, athletic and, on top of that, comes from a wealthy and politically significant family. And it’s not like he hasn’t tried either; but every girl he asks out flat out rejects him. Seiya sets a goal for himself to get a girlfriend by the time high school ends and rejection isn’t going to stop him from trying again. But it sure is heartbreaking when you get rejected this many times without knowing why.
Shinobu Satomi (Tori Matsuzaka) works in the Mobile Investigation Unit of The Tokyo Metropolitan Police Department. The Mobile Investigation Unit conducts the initial investigation at all crime scenes. He works with Yuki Inokuma (Fumino Kimura). They are a couple, but they keep their relationship a secret at work. They both hope to work at the #1 Investigation Station. One day, they meet beautiful Kara Tachibana at the site where a dead body was found. Kara Tachibana appears at the other crime scenes involving grotesque murders. She shows an interest in Yuki Inokuma. Shinobu Satomi thinks it's a bad sign for Yuki Inouma. To protect his girlfriend from danger, he struggles to find uncover the truth behind the serial murder cases and Kara Tachibana’s identity.
Yusuke Serizawa (Keisuke Koide) works at a law office. He gets into a car accident. A woman helps him and she looks familiar to him, but he doesn't remember who she is. Yusuke Serizawa looks back at his past romances.
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.