The Okay Idea, come to my party, shojo skip

From the South exit of JR Koenji station, turn right and find the PAL shopping street. Go down this street until you finally get to a major road with McDonalds on the corner. Turn right and a bit further up you'll see a Lawson 100 shop on the left. Club Liner is in the basement of that building. It's a bit far from the station but there are lots of cool shops to look at on the way. Otherwise, it's near Shin-Koenji station.