I’m not sure akasaka is the best place for pick up. There is a huge selection of izakayas in the area between akasaka mitsuke station and akasaka station. Also the usual collection of British style pubs. Of these Mermaid is probably the best. A few craft beer places as well with Yona Yona beer kitchen being the best. Several times when I’ve been there I’ve seen OLs having dinner by themselves.