From Renta!:

Two salarymen from opposing business sections have always been rivals. From work output to the most menial things, they compete at everything - business has never been so busy! But then, one day, they end up in an elevator alone... and it stops! Stuck inside, they try to escape, but it doesn't seem like there's any way to get out. "And tomorrow is a holiday, so no one will come... but there's something I still have left to do before I die," one of them says, as he kisses the other on the lips! Stuck in an elevator with no escape... "Hey! What are you doing?!" Hot, temperamental businessmen start battling each other with their dicks!