is a Japanese manga series written and illustrated by . It started publishing in Hakusensha's manga magazine (later renamed Young Animal Innocent) from September 2012 to March 2014 and started a regular serialization in the publisher's Young Animal magazine in March 2015. The series' chapters have been compiled into 22 volumes as of August 2026. A spin-off series, Eroko-san on the Attack, was serialized in Young Animal from July 2019 to September 2025, and another spin-off, Sekirara Hime to Minus Ōji, was published on the website from August 2017 to April 2019.
Plot The series follows Senko Amaguri, a high school girl whose family runs a cleaning and repair service. She encounters Ryō Takamura and Kōhei Sugita, two friends looking for a job. She becomes interested in Ryō after following them to the restroom and noticing that his penis has phimosis. The two become employees at the company, where they have to deal ith Senko's strong interest in sex.
Characters
Henjō
A high school student whose father runs a cleaning and repair service. She has a strong interest in sex and is fond of making sexual jokes. She has an interest in penises and can sense when a man has an erection. She does well in school and in sports and goes to a technical high school. Although she initially acts cold towards Ryō, she later develops feelings for him. She lives with her father as her mother is working overseas.
An employee at Handyman Amaguri. He has a strong sexual drive and masturbates daily, although he is still a virgin. His family is aware of his job but is worried that he does not earn enough from it. As time goes on, he develops feelings for Senko, although he remains confused about it.
Ryō's best friend since childhood and his co-worker at Handyman Amaguri. Unlike Ryō, he has sexual experience. He has a large penis, which Ruka nicknamed "Big Mountain". He later starts dating Ruka.
Ryō's younger cousin and a university student. She has had feelings for him since childhood and treats him as an older brother. She later starts working part-time at Handyman Amaguri, gaining an interest in penises because of Senko's influence. She later falls in love with Kōhei and they became a couple.
Eroko-san on the Attack
A 27-year-old NEET who is a popular social media personality and influencer. She is nicknamed "Eroko" due to its similarity to her name. She meets Natsuki, whom she calls Hoshi-kun, and desires to lose her virginity to him.
A high school student who goes to the same school as Senko. He confessed to her but was ultimately rejected. Formerly a delinquent, he dyed his hair black at Kōhei's suggestion. He later starts a relationship with Eruko.
Sekirara Hime to Minus Ōji
A high school girl who becomes an apprentice under Senko. Due to Senko's influence, she too becomes interested in sex, leading to her being nicknamed .
Publication Written and illustrated by , Henjō: Hen na Joshikōsei Amaguri Senko was first published for four chapters in Hakusensha's manga magazine from September 28, 2012, to September 27, 2013; the magazine was renamed Young Animal Innocent on March 19, 2014, and another chapter of Henjō was published; the magazine was discontinued afterwards. Henjō started a regular serialization in the publisher's Young Animal on March 13, 2015. The individual chapters have been compiled into twenty-two volumes as of August 2026. Drama CDs were bundled with the limited edition releases of volumes 6 and 7.
A spin-off series, titled , was serialized for three chapters on the website between August 7, 2017, and April 29, 2019.
A second spin-off series, titled , was serialization in Young Animal from July 26, 2019 to September 26, 2025. The individual chapters were compiled into nine volumes from January 29, 2020 to October 29, 2025. Comikey licensed the series in English.
Volumes
Eroko-san on the Attack
Reception It was reported in 2020 that Henjō had sold over a million copies.
References
External links