Arima worked in sales and disliked the new staff, Yano, who just graduated. Yano saw loves bites on Arima's neck & body during a drinking party. Yano helped Arima when he was drunk and found out the reason for the love bites on Arima's body. Things got hot from there.
Aru Shirigaru Bicchi Eigyouman A Certain Loose Bitch Salaryman