Hitozuma OL -Chijoku no Gyoumu Meirei-

Main character gets under restructure and seeks reemployment at Apparel Trading Company “Emission Co., Ltd.”. President puts a special entrance condition - to execute special orders on phone's call. Before being accepted to the sales department there needs to be training period in the administration department, and co-worker girls with lesbian ambitions harass protagonist all the time. Then comes the first task from the president - to get a photo of colleagues lesbian activities at night office.

[From vndbreview]