The series tells the story of Taichi, a camping enthusiast and native of Japan's Kansai region. During a solo trip, he stumbles upon a murder scene and is taken captive by a masked serial killer. What follows is a twisted cohabitation story, where his interactions with the killer are a constant battle of genuine terror and sharp-witted Kansai-ben (Osaka dialect) humor, earning it the reputation of a "new sensation" in BL.

Many versions use 3D microphones, making it feel like the killer is whispering in your ear while the Kansai-jin shouts from the other side.

A traveling salesman from Osaka takes a wrong turn and ends up in an abandoned warehouse — which also happens to be the workshop of a masked murderer who’s been terrorizing the prefecture. Rather than panic, the salesman starts critiquing the killer’s mask, offering food recommendations, and accidentally befriending (or deeply annoying) the very person trying to kill him.

Because this is an audio-only medium, the soundscape is vital. Listeners often experience:

The finale airs as a “live” episode (in-universe). Ryo storms the radio station, holding Mika hostage. Jin doesn’t call police—instead, he opens the mic to all of Kansai. “Everyone listening,” Jin says, “my brother thinks masks are lies. But sometimes the mask is a promise to keep living.” He then performs the same rakugo story their father died mid-telling—but Jin changes the ending to a joke. Ryo, hearing the laughter of thousands through the speakers, breaks down. The mask comes off. Not with violence, but with Jin’s arms around him.

The audio drama you're looking for is titled " Kansai-jin to Fukumen Satsujinki: Sex shite ii kara Korosantoite!

However, this blend has also sparked discussion. Some critics have pointed to the story's potential "romanticization" of Stockholm syndrome, where a captive develops affection for their captor. Yet, as one reviewer noted, the work is not intended to be taken seriously. Others have praised its ability to navigate these dangerous waters, creating a story where one can't help but root for the twisted couple.

As of 2025, the complete Kansai Jin to Fukumen Satsujinki audio drama is available in the following formats: