It's the very weak hand in a card game.

However, we 'one-pair' are selected from a lot of people,
it has a lot of lovely meaning,
and I think it's quite a probability.

トランプでは、一番弱い役が、ワンペアなんだって。

でもさ、
私たち「ワンペア」は沢山の人達の中で選ばれ、
かなりの確率だと思うし、
それって素敵な意味があるって思わない？