Fujisan Daifunka: Senryokugai Nintei Sareta Ossan Kaishain Mochizane ga Tenpenchii de Nariagari!?

Synopsis

‘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)