[YUJ-052] I was repeatedly pleasured by the supportive sex that made me forget all the unpleasant things, thanks to the tough older sister at my part-time job, Ebisaki Ao.

Tough.

That’s one translation.

Other sites went with “Blue Collar.”

Ebisaki Ao never wore a blue collar here, when she wore clothes at all. But she did wear blue pants and a blue cap.

The title does not actually say “Blue Collar Worker” or “Tough.”

It says ガテン系 Gatenkei meaning physical worker, blue collar type.

AI states that there are two main theories about the origin of the word ガテン”GATEN.”

One is that it originates from the word「合点（がてん）”GATEN” (meaning “understanding”), used by artisans, and has come to refer to the work and skills of artisans. The other is that it originates from the name 「肉体労働者」 “GATEN,” which was once used to refer to a job information magazine specializing in “manual laborers.”