From Renta:

Haru, a super popular "top" among the gay nightlife crowd, gets dragged to a host club after work by one of his regulars. There, he meets the overfamiliar (and super hot) Number 2 host, Shinya, who's exactly his type. He's super aggressive, even though he's straight! Fearing he might fall in love with the silver―tongued playboy, Haru tries to get out of there as soon as he can, but ends up forgetting his cell phone at the club! Is this for real, or is Haru just getting fooled by this smooth―talking hottie?