SALARYMAN KINTARO

After former motorcycle gang leader Yajima Kintaro saves the life of the Yamato Construction Company's CEO, he is offered a job working for the company. However, when it becomes apparent that a corrupt faction of the company is trying to gain full control, Kintaro's moral and physical strengths become more useful than the CEO ever imagined. As he works his way up the career ladder Kintaro is forced to deal with many problems, from confrontations with Yakuza bosses to preventing the collapse of a tunnel. But can an uneducated and rowdy person really make it as a salaryman? — Description from AniList community (anilist.co).