roughly the context: each pair would read a 4-koma of tomo-chan is a girl manga and the last part would have blank lines. they would ad-lib and make it as funny as possible to make the other 4 members laugh. the other 2 pair have a toy (idk what it could be called in english) that makes it so that when they laugh, it will produce a funny sound. For each person who laughs gets them 1 point and in this case everyone laughs so tsugutsugu pair gets 4 points.