The first installment is set in Ikebukuro. Unable to meet his quota and struggling to make a name for himself, Kajiyama finds entertainment by scraping together his pocket money and visiting a brothel once a month. One day, after finishing work at an izakaya, he is walking through the shopping district when he comes across a group of five high school girls stuffing their faces with extra-thick fish sausages. Startled by their appearance, Kajiyama thinks, "Something is calling me!" and heads straight for the brothel information center...

Tsuneo Kajiyama, 45, is an office worker at a beverage manufacturer. Due to the COVID-19 pandemic, his business performance has been dire. He also missed his monthly visit to a brothel. However, he suddenly discovered that even in these times, there's a safe and enjoyable option, so he heads to Shibuya's No. 1 M-erotic shop, still wearing his mask. His first experience with masochistic erotic sex opens a new door for Kajiyama.

The third installment is set in Akebonocho, Yokohama, an area lined with many commercial brothels. While working at a pub, Kajiyama is watching the manager's wife, who is busy with her hobby of pottery, as she plays with the clay on the potter's wheel. He thinks, "Something is calling me..." and heads to a handjob specialty shop with a reasonable price structure, where he enjoys a double petal play.

The setting for this story is Uguisudani, one of Japan's leading love hotel districts. When Kajiyama sees the Tsumagoi cabbages piled up in a greengrocer's, he decides to try out a meet-and-greet married woman delivery health service. There, a real-life adventure with a married woman awaits him in the afternoon.

The fifth installment is set in Yokohama's Koganecho district, an area packed with brothels. At his favorite bar in the Noge district, Kajiyama is stimulated by the bar owner, who stimulates his pressure points to energize him. He heads to the bathroom, unzips his trousers, and is astonished by the effect. He rushes out of the bar, saying, "On a day like this, I want to be massaged, loosened up, and reach orgasm!" and immediately heads to a men's beauty salon that offers hand services.

The sixth installment is set in Kinshicho, the most popular entertainment district in eastern Tokyo, lined with bars and love hotels. One afternoon during a business trip, Kajiyama bumps into his high school teacher, Ms. Ito, whom he had a crush on, for the first time in 30 years. For a moment, Kajiyama reminisces about the bittersweet days he spent with his teacher, but then he suddenly comes to his senses and decides to visit a female teacher image club.

The seventh installment is set in the Ueno area, which once flourished as a red-light district and where remnants of that era still thrive. Kajiyama is in the middle of a business trip when a woman wearing a hakama, a yukata kimono, and a large red ribbon in her hair appears before him. Kajiyama excitedly sees her off, and then he thinks, "Something is calling me..." and heads to a Taisho romantic health club with a retro atmosphere...

The eighth installment is set in Gotanda, one of Tokyo's most competitive red-light districts. Struggling with poor sales, Kajiyama's eyes are drawn to a female salesperson desperately trying to sell sex to a love hotel owner. Seeing this unusual sexual favor, Kajiyama thinks, "Something is calling me..." and comes up with the idea of ​​setting up a dispatch store based on the concept of "adult toy sales ladies."

In episodes 9 and 10, Kajiyama finally leaves Tokyo and heads to Namba, Osaka's most popular shopping district. After finishing work with Yamane Misaki, a junior employee at Utamaro Sake Brewery's Osaka branch, he heads to a concept cafe in high spirits. He hits it off with Yumi, a hostess working there, and heads straight for a hotel, but his lower body doesn't respond at all and the date ends in failure. The next day, he finally agrees to go on a sightseeing date with Yamane in Osaka, but they end up fighting and parting ways. "Kajiyama Tsuneo, Osaka Winter Battle. A crushing defeat," Kajiyama says as he walks with a blank expression. When he looks up, the word "prostitution" catches his eye. His eyes gradually regain their vitality, and he decides, "Prostitution is the only option for me!" and heads to the most famous establishment in Osaka.

In episodes 9 and 10, Kajiyama finally leaves Tokyo and heads to Namba, Osaka's most popular shopping district. After finishing work with Yamane Misaki, a junior employee at Utamaro Sake Brewery's Osaka branch, he heads to a concept cafe in high spirits. He hits it off with Yumi, a hostess working there, and heads straight for a hotel, but his lower body doesn't respond at all and the date ends in failure. The next day, he finally agrees to go on a sightseeing date with Yamane in Osaka, but they end up fighting and parting ways. "Kajiyama Tsuneo, Osaka Winter Battle. A crushing defeat," Kajiyama says as he walks with a blank expression. When he looks up, the word "prostitution" catches his eye. His eyes gradually regain their vitality, and he decides, "Prostitution is the only option for me!" and heads to the most famous establishment in Osaka.

The setting for the 11th installment is Sakaemachi, Chiba City, one of the Kanto region's leading entertainment districts, lined with many brothels. Kajiyama, whose sales performance has been poor and whose company is about to send him to a "re-education" program, desperately visits a shisha bar. There he meets the glamorous female manager in a black and white striped T-shirt, and the countless circular holes in the center of the acrylic boat installed to prevent splashes. Seeing this, Kajiyama's imagination begins to grow, thinking, "This is just like visiting in prison!" After leaving the shisha bar, Kajiyama visits a prison health club based on the concept of a women's prison, where customers become guards and can directly see the girls through a small window and choose the one they want.

The 12th installment is set in Shinagawa, Tokyo, one of Japan's leading business districts, yet still retaining a downtown atmosphere. One day, while on a business trip, Kajiyama is taking a break in the park when an owner appears in front of him, struggling to photograph their beloved dog. Seeing this, Kajiyama is reminded of an incident that occurred three days earlier. Three days earlier, Kajiyama came across a TV crew at an izakaya where he was on business. There, a director carrying a large camera was performing a unique gourmet report, sensually feeding the female reporter food. Kajiyama was so captivated by the sensuality of the scene that he thought, "I'd like to try filming like that," and decided to visit a health club that offers an AV course where video shooting is possible.

The setting for the 13th installment is Osaki, Tokyo, located between Gotanda and Shinagawa, known for its office district lined with skyscrapers. One day, during a business trip, Kajiyama, feeling depressed after making a series of mistakes at work, stops by a park. He happens to overhear a conversation between a group of people engaged in sketching, and hears the words "Sketching Dainoji Temple." When Kajiyama searches for "ejaculation ruined," the words "ruined orgasm" catch his eye. Attracted by the combination of "ruined," meaning ruined, and "orgasm," Kajiyama decides to visit a place where he can experience a ruined orgasm.

Tsuneo Kajiyama, who works at a sake brewery, was asked by Yukie, a teacher who runs a cooking school, to find a suitable sake to go with the food, and headed to the classroom. As soon as he arrived, he noticed that the women cooking were all making obscene dishes, their large breasts shaking. Unable to sit still any longer, Kajiyama quickly left the classroom and decided to visit a brothel specializing in big-breasted women.

The setting for the 15th installment is Kanda, a salaryman's town lined with old-fashioned offices and bars. While visiting Kanda for a sales call, Kajiyama is reminded by a coincidence of a fellow employee, Kimijima, whom he secretly had a crush on when he joined the company as a new graduate. Despite being in the office, memories of when he was excited by her sexy chest and hip line come back to him, and Kajiyama can't help but feel restless, so he heads to an office lady fashion health club to experience the office romance he's always dreamed of.

The setting for the 16th installment is the north exit area of ​​Ikebukuro Station, where adult entertainment establishments and love hotels are lined up. Kajiyama sees a sexy hostess demonstrating her skills at a tasting event for the Utamaro Sake Brewery where he works. She is a little nervous about her first job, but once she is relieved by the guidance of the sales promotion producer, she suddenly starts talking dirty, catching the attention of men on the street. Excited by this, Kajiyama decides that he too wants to coach women, so he goes to a health club with a "swimsuit" concept and plans to have some fun by pretending to be a swimming coach and swimmer.

The setting for the 17th installment is the Gotanda East Exit area, Tokyo's leading red-light district. Kajiyama, who has had nothing good happen to him today, is trudged through the streets of Gotanda. One day, he happens to witness a rehearsal for a local hero show. The Sentai Pink costumes are tight-fitting with a wide opening at the chest, and the villains' weapons have somewhat obscene shapes. Seeing the obscene tip of the sword approaching Pink's mouth, Kajiyama can't help but feel restless, so he heads to an image club where he can experience Sentai play.

The setting for the 18th installment is the north exit area of ​​Kinshicho, one of Tokyo's most popular areas. Kajiyama, feeling down after his boss scolds him for "showing his manliness" due to his poor sales performance and lack of enthusiasm, visits a certain izakaya to make a sales call. A certain incident leads Kajiyama to get close to the proprietress, and he becomes excited by the bustline exposed through the chest of her work clothes. Furthermore, when he sees the abalone and clams in the proprietress's hands and begins to imagine obscene things, Kajiyama can no longer contain himself and runs out of the bar, heading to a delivery health service where he can experience sweet and sadistic punishment and be liberated from his masculinity.

The 19th installment is set in Nishi-Kawaguchi, one of Saitama Prefecture's most popular hot spots. When Kajiyama visits a Chinese restaurant on business, the owner invites him to do some tai chi. It appears the restaurant operates as a "hybrid"—a Chinese restaurant at night and a tai chi class during the day. As he accepts the invitation and practices tai chi, a man named "Chen" appears, claiming to be the founder of "Monmon Tai Chi." Kajiyama is stunned by the erotic moves, but when he sees the extremely sexy-dressed female participants performing intense erotic moves influenced by Monmon Tai Chi, he can't help but leave the restaurant like a gust of wind. He then heads to "Hybrid Health Nishi-Kawaguchi," a place that combines aromatherapy erotic massage with intimate health.

The 20th installment is set in Shinjuku, Tokyo, home to one of the largest entertainment districts in the country and nicknamed the city that never sleeps. Kajiyama has developed mild aphasia due to the stress of his daily work. Unable to converse with clients, he visits the hospital, where the doctor points out his sexual frustration and suggests that he take some time to relax and refresh himself. Kajiyama, who feels particularly anxious about communicating with women, decides to relieve stress with a "robot delivery health" service, which does not require any interaction with women.