富士山大噴火～戦力外認定されたおっさん会社員モチザネが天変地異で成り上がり！？～

‘I wish the world would just turn upside down.’ Mochizane, an office worker, does nothing but apply himself earnestly to his job, yet his days are spent merely trying to keep up with an endless pile of work, all the while being looked down upon by a junior colleague from another department. Mochizane sets off with his boss for the town of Kodono, at the foot of Mount Fuji, to deal with a customer complaint. Already at the end of his tether, he resolves to quit his job, but…!? (Source: Shogakukan, translated)