Hyper-competitive Touya Shinougi has always lost the top position to Kazuhiro Nagase, so he's horrified when his former rival suddenly appears as a fellow salaryman at his workplace. Nagase is clearly trying his best to seduce the prickly Shinougi, but so far to no avail. Presumeably this will change at some point.
Otona No Koi No Hajimekata