DDK-150 Waitress Harua Narumiya confined in a store and used by multiple men

Waitress Harua Narumiya faces harassment from two customers who expose themselves and send obscene letters, then one day the men attack and confine her in the store, with the manager joining in after selling her to customers. They use electric massage machines and vibrators on her, and she ends up deep-throating repeatedly in a four-person scene.