TV in Japan

Looks like they're playing a version of 4-square, where someone names a category and each person has to name something that fits in that category and then hit the ball to the next person.
 

I love that she has holes in her costume for her pigtails.
 

they're playing a game called "shiritori" where they have to use the last syllabic character of a word to begin a new one. it's hard when it's done is such a fast pace.
 

The starter got to choose the category for every round.

"Otoko" (boy) was the failed word for the category "the kind of boy Gomaki wants as a boyfriend".
 

The person on serve names a topic, and all of the players have to say something relating to the topic as they hit the ball. Each player starts with 11 points. If a player fails to say something relating to the topic (or knocks the ball out of play), they lose a point. The game ends when someone has 0 points. The winner is the person with the most points at the end of the game.

(FYI, they list the rules at the beginning of the video.)