Cool Shock Old B.T.

"Even in his old age... he's still Devil Boy B.T."

- Koichi Mugikari, Cool Shock Old B.T.

Cool Shock Old B.T. (魔老紳士ビーティー) is a one-shot manga written by Nisio Isin, author of JoJo's Bizarre Adventure Over Heaven, and illustrated by, illustrator of . The one-shot takes place 60 years after the events of Cool Shock B.T. and stars an older B.T..

The story is presented as a standalone chapter titled "The Eerie Freckled Old Geezer Incident" (そばかすの不気味老害事件). In it, Koichi Mugikari falls for a scam from the "Outlaw Guys" and loses his house and retirement money. Ostracized by his family, Koichi can only rely on his childhood friend, B.T., to deliver justice.

Summary
An elderly B.T. is seen in his car with several items from the JoJo's Bizarre Adventure series as part of his collection. Koichi Mugikari re-introduces his best friend B.T. and presents the tale of this story, "The Eerie Freckled Old Geezer Incident". Meanwhile, Koichi's desk is taken and movers tell him to get out of their way. Koichi sadly walks out of his house, carrying a box of luggage while all of his other possessions are taken away. Suddenly, B.T. arrives behind him, nearly crashing into him. Stating that he's here to help Koichi move, B.T. asks how his best friend managed to get scammed and lose his property.

In a flashback, a man and woman from "The Outlaw Guys" company are at Koichi's house. They flatter Koichi for being a popular author and claim that their company will be able to settle his retirement expenses. They go into detail about various different banking accounts and money-making methods such as mutual funds, foreign exchange accounts, cryptocurrency investment, and the like. Koichi laughs at them and says he isn't the type of old man to fall for something like that. In the present, B.T. retorts that instead Koichi is the type of old man to let strangers into his home, asking if they looked like his son who left for the city 13 years ago. B.T. asks why they called Koichi "sensei", so Koichi reminds him that it was because he wrote a novel based on B.T. when he was 35 years old, which Rohan Kishibe drew the cover for.

The flashback resumes and the scammers make Koichi anxious by saying his house is violating the building standards act and it's possible he'll be arrested. They offer to sell him a single-family villa with a garden attached located in the suburbs of Morioh for 70 million yen. Koichi thinks that's a crazy amount of money but they convince him to sell his current house to pay it off so that Koichi's grandkids would be happy to visit him in the future. Back in the present, Koichi reveals that they also stole his life savings, pension, and late wife's inheritance. Koichi's son and his son's family were so dumbfounded that they stopped contacting him. Koichi and B.T. arrive at the villa, only to see that it's rundown and not what they offered to sell him. B.T. reveals that they tricked him by swapping the villa with a different one during the tour Koichi went on beforehand. Using a technique called structure relocation, they lifted the entire house with a jack and carried it elsewhere. B.T. examines the tracks on the ground and finds that they lead to which has a lot of conveniently empty houses. Once the tour was over, they moved the houses back to their original locations.

B.T. asks Koichi if he contacted the police, but Koichi said they didn't want to handle it since it was a legitimate contract and the scammers went into hiding. However, B.T. claims that's good for them since now they can get payback themselves. At the hideout of the Outlaw Guys, the group continues scamming elderly people. The scammers ask how old people could be so stupid and gullible but their boss angrily tells them to scam the elderly respectfully and not talk badly about them. One of the members brings their attention toward a video on J-Tube, pointing out that it has the man they sold the house to. The video shows Koichi as a rich celebrity, having found 100 million worth of diamonds in the furniture of his house. This is actually a ploy by B.T. and Koichi to lure the scammers to them. B.T. had his wife send furniture from London and the diamonds they "found in the furniture" were actually retrieved from a museum when they were kids. Koichi reveals that B.T.'s wife currently lives in England and is the sole CEO of a trading company after B.T. retired.

B.T. takes some oriental medicine while they wait, and soon the scammers arrive in the latest electric car model which can drive autonomously. B.T. and Koichi get dressed up using B.T.'s stage clothing, as B.T. was a former drama club member and even now does volunteer performances at child welfare facilities. Koichi dresses like a king, wearing lots of jewelry and the Red Stone of Aja. He pretends to thank the two scammers while they're baffled as to how he suddenly became so rich. B.T. dresses as a butler and brings them tea but as soon as they drink it, the male scammer collapses. B.T. then brings out a blade and intimidates the female scammer, claiming that he poisoned them with tetrodotoxin from blowfish. He says that if they want the antidote, she'll have to tell him where their hideout is and reveal the identity of their boss. Meanwhile, Koichi narrates that B.T. actually just put sleeping pills in the tea and not poison.

At the hideout of the Outlaw Guys, they wonder why the two members are running late. The boss reads through Koichi's Cool Shock B.T. novel and suddenly declares that they'll have to evacuate in two minutes. Before they could, B.T.'s car crashes through the building. The boss reveals himself to be Manabu, claiming that he knew they'd try to hit him with a car again since they did with an ambulance 60 years ago. However, B.T. doesn't recognize him. Manabu reveals that he already sold Koichi's house for seven million yen. He offers B.T. to make a bet. If he loses, he'll buy the house back since he still has the contract, and if he wins then he'll take B.T.'s vintage car. B.T. accepts and Manabu explains the rules. He reveals a pouch full of coins and says they'll gamble by scattering all the coins across the slanted tables, with the winner having to guess whether there will be more heads or tails. B.T. inspects the coins and asks where he got them from. Manabu replies that he blackmailed an old lady in a candy store by mentioning that her reputable grandson may have knocked up a teenage girl, so she ran around collecting money for him so he doesn't spread the rumor.

B.T. says he's fine with the game but would like to change the rules. He suggests that they decide the winner based on whether the difference between heads and tails will be an odd or even number. Manabu agrees and chooses that it'll be even, so B.T. goes with odd. Koichi is the dealer and tosses the coins as the game begins. Koichi notices that B.T. was palming a coin that he pickpocketed. If he placed an extra coin on the table, B.T. could ensure the difference would be an odd number. However, Manabu also had a coin hidden in his palm. Manabu notices B.T. move his hand so he also places his hidden coin on the table in order to make it an even number. He declares that he's the winner and laughs until he notices that it's actually an odd number. Dumbfounded at his loss, Manabu unsheathes his cane to reveal a sword and charges toward B.T. However, B.T. had hacked the autonomous car of the scammers beforehand and set it to target Manabu. Manabu is hit by the car and his sword goes flying, landing beside B.T. and puncturing his vintage car's tire.

Koichi relays that B.T. found the hideout of the Outlaw Guys by looking through the navigation history on the autonomous car. They use the car to send Manabu and his slaves to the police hospital. Meanwhile, B.T. opens Manabu's safe and remarks that he's glad Koichi caught on to his idea without any signals. Koichi reveals that he also had a hidden coin during the game as well, and had quietly placed it after both B.T. and Manabu placed their extra coins, thus making the difference an odd number again. B.T. finds the contract of Koichi's old house in the safe but it'll take some time for him to get it back. He allows Koichi to stay over at his house for the time being, insisting that his grandmother would be happy to see him. However, since B.T.'s tire was punctured by the sword, they'll have to walk all the way there. B.T. steals a wallet he found in the safe, as he and Koichi prepare to go on the long trek back home. Koichi narrates that despite still being a wicked boy at his old age, B.T. is still his best friend.

List of References
The one-shot contains many references to Hirohiko Araki's works, notably the JoJo's Bizarre Adventure series, the original Cool Shock B.T. series, as well as previous works by Araki himself. They can range from mentions to graphical nods. See here for a detailed list with image comparisons.