Dangerous Drugs of Sex (Japanese: Sei no Gekiyaku) is a boys’ love manga by Yuki Mizuta that turns confinement, sadomasochistic training, and life-or-death power exchange into a complete romance arc. Serialized digitally in Boys Fan from June to December 2018 under the longer title Sei no Gekiyaku: Midara ni Kaihatsu Sareru Karada (“Dangerous Drugs of Sex: The Indecently Developed Body”), it later became a single bound volume from Magazine Magazine (Junet Comics Pierce Series) and a 2020 live-action film sold as Japan’s first R18-rated BL theatrical feature. For kink readers, it is BL that treats SM training as plot engine, not a single spicy chapter.
Plot: suicide edge, rescue, and SM captivity
Makoto Katsuragi is an elite office worker whose perfect life collapses—parents die suddenly, he is forced to resign, and his girlfriend leaves. Drunk and impulsive, he decides to kill himself. Before he can jump, a mysterious man named Ryūji Yoden stops him and demands that Katsuragi forfeit his life to Yoden instead. What follows is confinement and sadomasochistic training: pain and pleasure pushed until Katsuragi has to admit he is still alive. He falls in love with Yoden and reconsiders dying. The setup is classic dark D/s fantasy—rescue that becomes ownership, training that becomes attachment—written inside commercial BL rather than underground SM erotica alone.
Manga run and film adaptation
Mizuta’s chapters ran in the digital magazine Boys Fan from June 21 to December 20, 2018 before the collected volume. A live-action film was announced in April 2019 with Sho Watanabe and Takashi Kitadai in the leads; additional cast included Kouhei Nagano, Ruri Shinato, Seiki Chiba, Sousuke Yamamoto, and Fumio Moriya. Hideo Jojo wrote and directed, and stated that the project would be the first boys’ love film with an R18 rating—signaling hard erotic content rather than soft TV BL.
The film screened first on February 14, 2020 at Ikebukuro Cinema Rosa. After a two-week private run it opened nationwide in Japanese theaters on March 6, 2020. International festival dates included Bucheon International Fantastic Film Festival (July 11 and 14, 2020), plus entries at the 2020 Taiwan International Queer Film Festival and Wicked Queer. Netflix Japan added the film on July 14, 2020, extending SM-themed BL to streaming audiences.
Reception and why it matters for BDSM media
The manga sold one million digital copies by 2019—huge reach for a short, intense SM-centered BL. Gay writer Mochigi reviewed the film positively, arguing it works for audiences across sexuality lines and that beyond erotic heat it gives the characters social depth instead of pure porn roles, pointing to scenes of Katsuragi’s life outside the training room. Kee Chang at Anthem noted that the film “asked a lot of its audience”—fair warning that the confinement/training premise is not light fluff.
On a BDSM site, Dangerous Drugs of Sex sits with other mainstream-adjacent works that eroticize capture, training, and forced living under a dominant’s rules. It is fiction, not a consent manual: the plot begins with suicide interruption and coerced life-forfeit, then tracks love growing inside SM practice. Boys’ love often flirts with power imbalance; Mizuta commits to sadomasochistic training as the path out of suicidal numbness. Treat the work as dark romance with SM furniture—captivity, pain-pleasure training, life claimed by a dominant—and keep negotiated CNC ethics for the bedroom, not as a script copied from Katsuragi and Yoden. Readers who want Japanese BL that does not blink at sadomasochistic development will find both the one-volume manga and Jojo’s R18 film built exactly for that appetite.
