Spoiler answer to your question!!
That's Kabu's friend from high school Sangou-san and he tells some (lies?) to Onoe so he and Kabu have a big fight by the end of the chapter. Screw you Sangou!!!
ヽ(`Д´)ﾉ
kabu was straight to begin with, maybe bisexual. he only had sex with guys a few times for his job, but was never in serious relationships with men, so i highly doubt he would have an ex boyfriend...
Thank you, both!!! I was oh so worried! and noooo I was so proud of them, don't want them to fight! there won't be a new chapter till may so I'll go die in the meantime
So kabu was in love with that man in the past??
In case someone is interested, and/or speaks some japanese, you can find and download here raws for the following 6 chapters, the last one translated here was ch.6 according to the web so you can start on 7.
Spoiler questions at the end of the comment**
https://ba-raw.livejournal.com/?skip=5&tag=ameiro%20paradox
WHO'S THAT GUY IN CHAPTER 12? IS IT KABU'S EX BOYFRIEND!?!?!?!?