Asumu Ushiromiya

Asumu Ushiromiya (右代宮 明日夢) was Rudolf Ushiromiya's first wife. She died six years prior to the start of and is initially believed to be Battler Ushiromiya's mother. Asumu never directly appears in the story but is mentioned frequently in the game's dialogue and TIPS. Asumu and Kyrie Ushiromiya both became pregnant by Rudolf at roughly the same time. However, Kyrie's child was stillborn and Asumu's lived.

Upon Asumu's death, Rudolf immediately remarried with Kyrie, leading Battler to believe that Rudolf had betrayed Asumu. Battler then cut ties to the Ushiromiya family for the next six years. While she is vilified by Kyrie, it is hinted that Asumu was vastly different than how Kyrie described her. It is implied that Asumu was actually a gentle woman that Rudolf married out of love rather than obligation.

Asumu appears in the Extra arc as the witch Piece. As Piece, she creates a reality wherein she never dies and Rudolf never remarries, thus saving the Ushiromiya family from virtually all pre-established hardships.

Last note of the Golden Witch
In, Asumu appears as the witch Piece, who poses the mystery of her identity to Beatrice, Battler Ushiromiya, and Ange Ushiromiya.

Trivia

 * Despite Kyrie being better with logic puzzles, Asumu is canonically better than Kyrie at puzzles.