The "Oka-san" song is one of their other new singles to go along with "Honey Trap".
On to the episode...I kinda knew Minori would be one of the final three since she seems like a very strong-willed woman. I'm not surprised that Yuma was the first one out since she's seems really emotional. I loved how some of the Muscats that took multiple attempts to show they were sincerely crying. I would've believed that after the second time, Sayoko was really crying. Then for Manami, she seems to have a bit of an issue producing tears no matter how much she's bawling (I hope it's nothing too serious). I think every time someone got smacked in the head, it was like a reset. Finally, what got me laughing was one of the old ladies was "cleared". Speaking of, the old ladies were singing a bit of something that I've heard in other variety shows (after they gave that speech).