Mitsuru is an otaku and character designer. When he needs to hire a housekeeper, he chooses Nagisa, who looks just like Mitsuru's character Lain-tan. Nagisa quickly falls for Mitsuru who deosn't judge him based on his flashy appearance, but Mitsuru keeps rejecting Nagisa.
Sokabe is gay salaryman and has a crush on his neighbor Motoi. When his bag is stolen and he can't enter his apartment, Sokabe goes to Motoi's apartment to ask for help and finds Motoi's extensive collection of BL manga. Sokabe is caught reading them and Motoi misunderstands, mistaking him for a fellow fudanshi.
Fudanshi Kanata is a repeating his university exams, so his parents get him a private tutor. The tutor, Seiichi, looks exactly like Seijurou, Kanata's favorite character from a BL manga, though personality wise, they're exact opposites. Seiichi promises Kanata if he can meet the conditions, he'll become his personal boyfriend.
New part time teacher Shiba is a hidden idol otaku who is a fan of the idol group Planet. He always goes to the same shop to preorder their CDs. One day, while on the train, he realizes the flashy worker from that shop is actually one of his students, Kurokawa. Kurokawa promises not to share his hobbies, if Shiba becomes his dog.
At a cosplay event, Reo falls in love with a girl cosplay his favorite character and the two hit it off. But, the girl is actually Haruto, a crossplayer and an upperclassman at Reo's school. Even though he was shocked, Haruto being a guy doesn't change Reo's feelings at all.
Mikado hates his obnoxious superior Anezaki, who pushes his work on to Mikado. After getting drunk at an office party, Mikado is forced to take Anezaki home, but, not knowing his address, takes him to a love hotel. While at the hotel, a wasted Anezaki climbs on top of Mikado and asks him to film, so when a sober Anezaki asks Mikado not to tell anyone what happened, Mikado has the perfect blackmail. Though, it becomes useless when Anezaki discovers Mikado is a secret idol otaku.
Kuroe, a member of the video game club, goes to the cosplay club to commission a cosplay for a game his club is selling at an event. Touma, the famous costume maker for the cosplay club, tells Kuroe based on the design the commission fee would be 100,000 yen, making it impossible for Kuroe and his club to afford. However, Touma is willing to do it for free if Kuroe agrees to be his model, but Kuroe didn't expect to be modeling a full-body skin suit.
After seeing his favorite idol, Love-chan, on the train, Taichi follows her home and begins stalking her. However, he gets caught by her manager, Nakata, but instead of taking Taichi to the police station, Nakata takes him to a love hotel and takes Taichi's virginity. Afterwards, Taichi's interest switches to manager Nakata.
Ch. 7: Archery club leader and secret otaku Inui is dating his club kouhai Chiharu, who look like his favorite magical girl. When Chiharu finds out he looks like a girl Inui likes, not knowing she's an anime character, he becomes upset thinking he's a substitute
Pheromone Syndrome: a hypersecretion of pheromones that induces arousal in those who desire the infected
Ch. 2: Playboy Tatsumi uses his pheromone syndrome to sleep with women by avoiding taking suppressants. However, Tatsumi makes the mistake of letting gloomy otaku Inui touch him after noticing he's affected by Tatsumi's pheromone syndrome
Uchi No Tenshi Ga Kemono Deshita.