Ochigi Mogiri's Manga List

Rinka Shiomi is an office worker at a beauty device manufacturer. In her relentless pursuit of results at work, her enthusiasm backfires, and she ends up being transferred to a notorious department that's rumored to be the company's "voluntary resignation track."
She gets assigned to the Special Development Division, where she meets two eccentric men. However, it turns out that what they're developing aren't beauty devices...

They say they're goal is to make girls feel good. And so, under the guise of "device development," Rinka's body is introduced to pleasure. As she unravels, the men grow more obsessed, escalating their advances.