Kakushitagari no Douki-kun

Karen Inuyama is an office worker who loves fine muscles. Her blissful moment is interrupted by her nagging coworker, Takuma Hosokawa.
Today was our regular house-drinking party. The place was Hosokawa's house.
A series of happenings lead her to discover an unexpected side of Hosokawa-kun.
I can't believe he was hiding something like that!
The battle against the cynical coworker is about to begin!