It's the return of the seiyuu game but with a twist. Instead of trying to guess anime voice actors the group has to guess the anime song vocalist.
Though there are some other really fun moments so I would recommend this episode. In fact out all the more low key episodes this game is always a fun watch as the voice actors always seem to enjoy themselves and the anisong singers in this episode are really no different.
The next episode should be another fun episode as it is one of the mix drink games, this time the sport will be soccer.