Part-Time Confidential

College student Tsutsui Shinichi is offered high-paying part-time jobs by Moguro and takes one offered by an old man to go out and have a good time on his behalf, as long as the money is not spent on something pointless. Unfortunately Tsutsui loses a fortune to some thugs at a mahjong club and when he goes back to the old man's house with the thugs to get more money, they find that he's gone.