The world is truly in the age of commercials!　Depending on the advertisement, even black can be made to look like white. Shogoro Tobita, who dreams of becoming a cool CM guy, joins "Jun Advertising (Ad) Center" located under the building of the largest company in the industry, "Daidenpoin" (......). The company building is a shambles, the president is a super weirdo, and the only employees are Komako Sugo, a beautiful secretary with a zoo dialect, and a senior monkey named Copy!　How can such a company survive?　A nonsense gag serialized in "Weekly Shōnen Sunday" in 1970! (from ebookjapan)

From Digital Manga Publishing: The time is the first decade of the twenty-first century. The place is Tokyo, Japan. Specifically, the ward known as Shinjuku. An 8.5 earthquake shatters Shinjuku, destroying buildings and streets and turning the bustling ward into a haunted ghost town plagued by the paranormal and the bizarre. Scientists and ESP investigators, along with criminals, enterprising yakuza gangs and mutant cyborgs come to “Demon City”; some to study the effects of the Devil Quake, others to commit heinous acts of savage violence, and still others to live freely in this lawless town on the edge of the abyss. This is the world of Demon City Shinjuku and how it all began. It is now 2030 and President Kozumi Rama of the World Federation is attacked by an otherworldly demon Reba Ra, an evil sorcerer of immense power. The only person who can stop Ra is Yogi Master Agni Rai’s former apprentice, Genichiro Izayoi but Genichiro is dead. His son, Kyoya Izayoi, a high school student and the inheritor of Izayoi’s killer nenpo martial arts technique, now enters Shinjuku to try to stop Sorcerer Ra from unleashing the ultimate horror in Demon City. The fate of Shinjuku and the rest of the world hangs in the balance.

This is a coming-of-age story depicting the days of torment and lust for a young man, Sei, who was instilled with a distorted view of sex at a young age that reminded him of toads' mating. One day, after being told about sex by older boys, the young Sei insisted that his mother would never do such a thing. However, when Sei woke up in the middle of the night, he was deeply shocked to see his mother having sex......! (Source: eBookJapan Plus, translated)