She was the ace.

Keyword being was.

Basically in poker card games, the ace has the higher rank than the king, Queen and jack. However in guardians, it is a totally different thing. Ace means nothing; at least that's what the ace herself thought. She knew only recently that even though she chara changed, she never really did something beneficial to the group.

But now she didn't have to think about it that much because she is no longer an ace. To specify, a former ace.

Yep, Yuiki Yaya has finally graduated from elementary school and had moved on to middle school thus, no longer a guardian and an...