This drama is adapted from the manga of the same name. It tells the story of Oda Teruoma, whose mother died unexpectedly when he was a child. He lives with his father, who runs the Oda Group, one of Japan's leading general trading companies. However, his father entrusts him with an old key called the “Devil's Key”.Shortly after giving the photo, he was killed by a mysterious man in front of his eyes.In order to explore the secret of “Devil's Key” related to the truth about his father's death, Teruomao wandered around the world. However, one after another mysterious property transfer incidents occurred, so he returned to Japan.Then, a character aiming at the “Devil Key” appears in front of Teruocha, and he must challenge “ACMA:GAME”...

Oda Teruyu (played by Shotaro Mamiya) who is drifting overseas risks his life many times.But each time, he survives the fatal situation thanks to an old key he carries with him.It is said that there are 99 keys in total.Huiyu travels around the world to find the remaining keys and pursue the mystery of the keys.

When Huiyou saw the news, he suddenly decided to return to Japan.Huiyou stared at the key in his hand, and the memory of his father came to his mind.

Fourteen years ago, I was taken to a camp by my father, Seiji (Koji Yoshikawa), who was serving as chairman of the Oda Group, one of Japan’s leading general trading companies.Under the starry sky, Seiji showed an old key to Huiyu and told him that it was a “devil's key” and that as long as you hold it, it will bring good luck.This is the fateful encounter between Huiyu and “Devil's Key”.

Terutomo returns to Japan and visits his father's company, now known as the Miyanouchi Group, which is taken over.

There she meets her late father's secretary, her trusted Ryuto Okamoto (Jun Hashimoto).

Huiyou tells Ryukin that “Devil Key” is related to mysterious property transfer cases that frequently occur in Japan.Thirteen years ago, her father Seiji was killed by a man (Kokichi Ozawa) who appeared behind the Devil's Key.Huiyu was entrusted with the “Devil Key” before he died, and escaped overseas with the help of Ryukin.

When Terutomo returned to Japan after 13 years, Ryukin was not the only one to welcome him.

Hatsu Saito (played by Tatsumi Tanaka) and Yuki Manabe (played by Kotone Furukawa) are good friends from the same junior high school. They developed the next generation of generative artificial intelligence and founded a venture capital company.The two people who had been worried about Huiyu who suddenly went overseas learned from SNS that Huiyu was in Japan.

Yuki immediately contacted Teruyu.When the three met again after many years, Chu, who had had friendship and competition with Huiyou, had an awkward attitude towards Huiyou's current state.When Huiyou returned home, he saw a familiar man's face.This was the man he saw on the news about the property transfer case overseas, and the man who killed his father 13 years ago.She hurriedly chased after him, but the man quickly disappeared.

The next day, Ryukin came to Huiyu's room.Liu Jin told Hui You that he had been investigating a series of property transfer cases.By chance, Yuki also came to visit.Then the doorbell rang.When they opened the door, they discovered the second generation of Maruko Mitsuhide (played by Kenta Suga) of the anti-social organization “Maruko Family” and his followers.

Maruko comes to steal Huiyou's “Devil Key”.In front of Teruyu, who didn't know the true meaning of the key, Maruko took out her “Demon Key”, slowly inserted it into the table and turned it.Then, a tornado appeared, and a giant beast appeared in front of me!

Teruyu (played by Shotaro Mamiya) is shocked to learn that Maruko (played by Kenta Suga), who lost in the evil bear game, lost his life for the bet, but he warns her that possessing the “Devil Key” is dangerous.He declares to Ryukin (Jun Hashimoto) that he will challenge the game and collect keys to get close to the person (Ozawa Yukitsu) who killed his father Seiji (Yoshikawa Koji).

Teruyu doesn't want to put his precious friends Hatsu (Tatsuki Tanaka) and Yuki (Furukawa Kotone) into more danger, and tries to distance them by telling them not to get involved again, but Hatsuyu feels for TeruyuAnnoyed.Finally say the harsh words.

At the same time, mixed martial artist Takeshi Hyoto (played by Eijin) won a martial arts competition with a landslide victory.I was alone in the waiting room, staring at the “Demon Key” in my hand.Although it is difficult for Hyoudou to win, since he encountered the Demon Key, he has won consecutive battles and gained money and power.

At the cabaret club where he went to celebrate after the Hyōdo match, Chiya Uesugi (played by Ryusei Ryo) appeared in front of him and suggested that he could get what he wanted if he took Oda Teruyu's key.

After the quarrel, Yuuki wanted to reconcile Huiyu and Hajime, and invited Huiyu to dig out the video letters buried when the three were in their second grade of middle school, but Huiyu flatly refused.He asks Hajime to invite Teruyu, but Hajime is busy raising funds for the company and is in no mood to do so.

Yuki, who had no choice but to go to junior high school alone, found Teruyu standing in front of the school gate and forcibly pulled him in.When the two dug out a corner of the campus, they found a tin box and took out a DVD from it.

Huiyou was about to read a video letter in the classroom. He turned to the direction where the sound came from and saw Hyoudou pointing a knife at Yuki.Hyoudou, who had the devil's key hanging on his chest, put pressure on Terutomo and said: “Give me your key!” Hatsu arrives and pounces on Hyoudou to save Yuki, but he is taken hostage.

Hajime tells Terumomo and Yuki to escape.Huiyou, who didn't want to lose the one he cared about anymore, inserted his “Devil Key” into the floor and shouted “Come out, Devil!” Gadot emerges from the tornado and the second round of the Akuma game begins!!

In front of Terutomo (played by Shotaro Mamiya), Chiya Uesugi (played by Ryusei) has information about Shu Nobu (played by Yukitsu Ozawa) who killed his father Seiji (played by Yoshikawa Koji), but Chiya... I will tell youof.Win the game,” he said and left.

At this time, Miyanouchi (played by Masanobu Sakata), the president of the Miyanouchi Group, accidentally obtained the “Devil's Key”, and increased the number of “Devil's Key” at the instigation of Zhou Xin's subordinate Nagatute (played by Kiriyama Ren).He tries to challenge his idol Murasaki Shikibu (Rina Arashi), who has never played a demon game before, but suddenly Sakuya appears...!

Huiyou visited the graves of his father and mother for the first time in 13 years.When Teruyu places the mogu chocolate developed by his mother Reika (played by Yui Ryoko) on his grave, he is reminded of the promise he made to his parents when he was young that he would inherit his father's company and sell large quantities of moguchocolate.When Teruyu apologized and said: “I'm sorry that I couldn't fulfill my promise at that time”, he received incredible news from Yuki (played by Furukawa Kotone)!It is said that Miyanouchi lost to Saiyan in the Bear Competition and transferred the management rights of Miyanouchi Group to Saiyan!

At the same time, Hajime (Tanaka Tree), who is busy raising funds for the company, received a call from an investment company that was interested in Orochi“ (CV: Hanazawa Kana) developed by Yuki.Hajime enthusiastically stated that if he received investment from this company, he would definitely make Orochi widely popular.

Terutomo, who was heading to the headquarters to meet with Miyanouchi, met Hatsumi who came after seeing the news.Chairman Miyanouchi's office where the two boarded the plane was once a sacred place for his father's work.The people in the chairman's office are the genius gambler Senya and the idol Zi.When his father's beloved company is being toyed with, Huiyu cannot remain silent and challenges Saiyan!”Play a game with me.“

When Teruyu challenged, Ayaya used his ”Demon Key“ to summon the demon Kato (CV: Junichi Suwabe), as if to say he had been waiting!Tsutaya plans to crush the Miyanouchi Group after winning the game, but Teruyu demands that Kato have the right to deprive Tsutaya of his gambling rights if he wins.So, if Huiyu loses, Sanya demands that he have the right to fulfill three wishes...!

With each other's requests completed, the evil bear game between Huiyu and Xianya begins!The game prepared by Gado is a card game called ”五一%.