The pinned tweet explains the service. Auto-translation is a bit broken, but should translate roughly to this:

"I'm starting a service called 'rental person who does nothing'. [For example] for stores where entering alone is difficult[0], for matching the number of players in a game, to hold a hanami[1] spot. Please only use it for cases where one person is needed. I charge 10,000 yen, plus transportation fare from Kokubunji station, and food and drink (if applicable). I won't do anything other than very simple responses."

So it's not strictly a listening service per se.

[0] in Japan, there are food stores that are geared towards couples

[1] https://en.wikipedia.org/wiki/Hanami (the context here is holding a picnic spot)