The new right-hand man of Hyoudou and best candidate for succeding him, after Tonegawa's defeat. He watches over the underground labour camp and he is the superior of Ichijou, which is his favourite one.

Several months after the events of the first season, Kaiji, with his appendages reattached and his debt now run up to 9.5 million yen, is still desperately seeking the elusive big score that will cancel all of his markers. Unbeknownst to him, Hyodo’s company, the Teiai Corporation, is actively searching for Kaiji, and have sent Kaiji’s old “friend” Endoh, who entered him in the high stakes games in the past, to find him. 
The two meet when Kaiji chances to walk in front of Endoh’s car at a stop light, and thinking that he has found the answer to his prayers, Kaiji gets in the car with him. While Kaiji and Endoh are “happy” to see one another, and both want to see Kaiji’s debt repaid, their means to that goal couldn’t be more different. 
Instead of leading Kaiji to the big score, Endoh delivers him drugged and docile to the Teiai Corporation’s secret underground labor camp where Kaiji will have an opportunity to repay his debt… with 15 years of hard labor. 
(Source: Sea Slugs)

Teiai Group is one of Japan's largest firms. Yukio Tonegawa, a man with a larger-than-life presence and sharp intellect, works as the right-hand man of Chairman Kazutaka Hyodo. One day, the chairman commands Tonegawa to spearhead "Game of Death," an evil project that employs debtors. He rallies his direct reports and scrambles to form Team Tonegawa, only to encounter a barrage of challenges from the erratic chairman and his disloyal employees, ultimately leading to his demotion.
 
Team Tonegawa is bombarded with an onslaught of wide-ranging problems! "Mr. Tonegawa - Middle Management Blues -" is a spinoff of "Kaiji," the hit manga series that boasts a total circulation of over 20 million printed copies.
 
(Source: Nippon TV) 

Note: Episode 14-15, parts of 18, and parts of 20-23 of this entry adapts the Kaiji spin-off manga Ichinichi Gaishutsuroku Hanchou.

After Kaiji's showdown with Chairman Hyoudou at the Starside Hotel, he's forced into labour at an underground mine. With his meagre daily wage, he'll be working for decades to repay his debt unless he does something about his miserable situation.
Kaiji decides to wager his earnings in an underground dice game for a ticket to get out of the mine for a limited period of time. But even if he surfaces, he only has one chance to win it big: by challenging the unbeatable pachinko machine nicknamed "The Bog."



The continuation of the Kaiji series, picking up immediately after the end of One Poker Hen.
 
One Poker has been concluded, with Kaiji emerging as the victor and claiming the 2.4 Billion Yen as a prize! But now, a new problem arises... how can the Asian Trio take it with them with Kazuya's Black Suits gathered right outside the entrance of the warehouse?!
 
Chapter count for this arc begins at 255 in the original tankoubon.

Teiai Group is one of Japan's largest firms. Yukio Tonegawa, a man with a larger-than-life presence and sharp intellect, works as the right-hand man of Chairman Kazutaka Hyodo. One day, the chairman commands Tonegawa to spearhead "Game of Death," an evil project that employs debtors. He rallies his direct reports and scrambles to form Team Tonegawa, only to encounter a barrage of challenges from the erratic chairman and his disloyal employees, ultimately leading to his demotion. 
 
Team Tonegawa is bombarded with an onslaught of wide-ranging problems! "Mr. Tonegawa - Middle Management Blues -" is a spinoff of "Kaiji," the hit manga series that boasts a total circulation of over 20 million printed copies. 
 
(Source: Nippon TV)
 
Includes 9 bonus chapters.

Yoshihiro Kurosaki