Keiji Nishiono， 36， runs a small， unsuccessful detective agency with his only assistant， the beautiful-but-strict Eisei Takatoh. Laid-back and empathetic to a fault， Keiji is constantly being scolded by Eisei， who is much more of a realist. One day， they accept a case about relationship troubles and go undercover as a couple to infiltrate a gay bar...!! Their investigation goes well， but egged-on by the gay men around them， they end up kissing. After that incident， they start seeing each other as more than business partners......