Kosaku Shima depicts the life of Kosaku Shima, a salaryman, a Japanese white-collar worker who devotes his life to his company. 
At the start of the long-running series, Shima K&#333;saku is a kach&#333;, or section chief, of a huge conglomerate, Hatsushiba Electric. He is later promoted to buch&#333; (division chief) and eventually promoted to manager and executive-director, and with each promotion the title of the series changed as well. He is now promoted to the president of Hatsushiba Electric. And the title changed "Shach&#333;" Shima K&#333;saku, which means "President K&#333;saku Shima". 
The fictional conglomerate is modeled after Panasonic, or Matsushita Electric, where Hirokane worked before and is highly accurate in its portrayal of Japanese corporate culture.

Shuukan Shimakou is about a life of a Japanese white-collar worker salaryman, Shima Kosaku.

A spin-off of Shima Kousaku, where the main character is a knight in another world.

Hatsushiba Electric president Kiichi Nakazawa, who has been Shima&rsquo;s mentor since Nakazawa was Shima&rsquo;s boss in the sales division, transfers Shima to Hatsushiba Trading, the firm&rsquo;s affiliate, to keep Shima from being involved in a factional power struggle that seems sure to erupt within the company when Nakazawa resigns from his post. 
Shima starts off as the representative executive director, making a deal with a wine producer in France. He flies between Japan, France and England to find the best wine and to sell cases at the best price possible. As always, Shima gets help from various attractive women &ndash; his subordinate Kumiko, with whom he has had a long, ongoing affair; Kumiko&rsquo;s mother, who has a broad network of rich people around the world; and a mysterious hostess at a cosy Shinjuku bar who knows who&rsquo;s who in the wine business. 
(Source: The Star).

The year is 1990. Kosaku Shima, at this point still just a section manager, meets a woman at a bar. However, when he wakes up, he finds that the woman has been strangled. With the help of his detective friend Kyusaku, he sets out to find the real killer and prove his innocence.

After being killed by a passing robber, a normal 37-year-old guy finds himself reincarnated as Kousaku Shima in 1984.
 
Note: The volume contains the only 2 chapters of the spin-off, 2 chapters of the manga Kachou Shima Kousaku, and one chapter of the manga Tensei Shitara Slime Datta Ken

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