Mature/Story

Orochi Saga
Mature is one of the Hakkesshu. She joins forces with Vice to serve her master, Orochi. She often takes orders from Leopold Goenitz, although she doesn't like him. She and Vice were ordered to keep an eye on Rugal Bernstein, who was trying to use Orochi's power.

The King of Fighters '94
Mature posed as one of Rugal's secretaries. During The King of Fighters '94, she congrats the Hero Team invites the victors to board the Black Noah, Rugal's battleship. It is implied that she did escaped Black Noah before the ship exploded.

The King of Fighters '95
The champions of the previous year, the Hero Team, were given a surprised meeting by Mature, who gives them the invites to KOF '95.

The King of Fighters '96
When Rugal died, Goenitz ordered Vice and Mature to keep an eye on Iori Yagami and bring him to the 1996 tournament. They didn't win the tournament, but when Kyo Kusanagi and Iori defeated Goenitz, Iori entered the Riot of the Blood and killed both her and Vice.

The King of Fighters '97
Iori, for the past year, has been suffering from mysterious headaches and hallucinations. While he had no intention of joining this year's KOF, he is suddenly approached by Mature and Vice. Although dead, both women continue to haunt Iori as shadows to entertain themselves, with the two mocking Iori's inability to kill Kyo. Iori decides to joins KOF, albeit as a solo contestant, to kill Kyo.

The King of Fighters XIII
Not knowing why they still exist, she and Vice tempt Iori to enter the newest tournament and volunteer to be his teammates once more. The women want to prevent Orochi's power from being stolen by Ash or Those from the Past. She looks forward to seeing him fight without his flames.

After the climax of the KOF XIII tournament, Iori's magatama returns to his possession and the weakened Orochi seal begins to strengthen itself once more. Both she and Vice ask if he truly wants to accept the magatama and the Orochi blood once more, offering him a final chance to completely eradicate the cursed fate from his bloodline. When Iori refuses their offer, the women fade once more out of existence. They state they will meet him again in his dreams.

The King of Fighters XIV
Mature and Vice return once more while Iori visits a grave. Vice tosses him an invitation to KOF, she mentions that this KOF is just the beginning of the nightmare. Just like in the previous tournament, Mature looks forward to seeing Iori fight with his flames.

After the climax of the tournament, Mature and Vice don't stop Iori who was going to seal Orochi. She states that all destinies are beginning to shift, with Vice agreeing, she comments that Iori can't resist his blood once it boils. The women return to the dead once more.