As Asuna, Kirito, Yui, and the army lady descend, Asuna tries to spark up a conversation.

"So, what's your name?" Kirito asks the army lady.

"I'm Yuiler."

"I had no idea a dungeon like this was beneath the Town of Beginnings." Asuna exclaims

"This wasn't here during the beta test." Kirito adds.

"It probably opens further, as the floors above are cleared." Yuiler says.

A few minutes pass In silence which is broken by Yui when she asks, "are we there yet?"

"No." Yuiler replies.

A few more minutes of silence pass, this time the silence is broken by Yuiler.

"Thinker hasn't moved from here."

Yuiler points to a location on her map.

"I think it's a safe zone." She continues.

"If we get to the safe zone we use our teleport crystals to escape." Kirito reasons.

As Kirito and his comrades round the bend in the dungeon.

"Thinker!" Yuiler yells.

"Yuiler, stop!" Kirito yells to Yuiler.

But Yuiler didn't heed Kirito's advice, she kept on running. Right into a deadly monster who promptly smacked her back towards the rest of the group, taking around 75% of her health points in the process.

"Asuna, retreat to the safe area with Yui and Yuiler." Kirito demands.

"Right." Yulier replies.

"Mommy Let's go." Yui tells Asuna.

"Asuna, use a teleport crystal to get Yui and the others out of here." Kirito continues demanding.

"Even my identification skill isn't helping." Asuna cries

"It's probably as strong as something from the 90th floor, I'll buy time." Kirito says.

Asuna continues standing still while Yuiler carries Yui to the safe zone.

"Run!"

"Y-You come with me."

"I'll catch up."

Kirito flashes asuna a grin and a thumbs up. Before getting hit across the room, his HP going into the red.

"Daddy!" Yui cries as she breaks free of asuna's grip and runs into the middle of the fight.

"Yui, no!" Yuiler yells.

"Come back!" Asuna cries.

"Don't be stupid, get out of there." Kirito screams, desperation flooding his voice.

"Mommy, daddy, it's ok."

The monster, realizing it has another tasty treat turns and slashes Yui with its sword.

Immortal object

Everyone looks at Yui, a sense of wonder filling their eyes.

A giant flame appears in yui's hand. After close inspection Kirito realizes that it's a giant sword.

"W-w-what the heck Yui?" Kirito exclaims.

"I remember everything now." Yui says as she decentagrates the monster.

She joyfully runs over to her comrades.

"This world, Sword Art Online, is controlled by a single, immense system . The system is called Cardinal. This system was designed to operate without any human intervention. It regulates the balance of SAO, according to its own discretion. From monster and NPC AI, to drop rates for items and money. Everything is controlled by the processes the Cardinal program executes. Even player psychological care Mental Health Counseling Program, prototype 1. Code name: Yui. That's me. I was given the ability to emulate emotion, to put players at ease with me. I'm a fake All of me. Even these tears. I'm sorry, Asuna and Kirito. Two years ago, on the day of the launch For reasons I never understood, Cardinal forbade me from interacting with any of the players. I was forced to do nothing but continue to monitor the players' mental states. It was utterly horrible. Terror, despair, rage. People were overcome by negative feelings. Some of them went completely insane. Normally, I would have gone to them immediately. But I wasn't permitted any contact with them. Gradually, errors accrued within me, and I fell apart. But one day, I saw two players whose mental parameters were very different than the rest. Joy and peace. But it was more than that. I wandered through the field, hoping to get as close to you as I could."

"Yui we don't care what you are. We love you just the same. And we want you to stay with us." Kirito says.

"It's too late." Yui replies.

"Huh?"

"This console grants the GMs emergency access to the system. I used it to delete that monster. But now it's running a check on my program. Since I've disobeyed Cardinal's orders, it considers me a foreign object. I'll be deleted soon."

"There must be something we can do." Asuna says in a weak voice.

"Mommy, daddy. I love you." Yui says in her final moments. Then, she disappears.

Asuna falls to the ground, tears spilling out her eyes. But Kirito, Kirito felt a strange determination well up inside him. He runs over to the console that Yui left unlocked.

"Wha-what are you doing Kirito." Asuna asks. Her voice hoarse from crying.

"I'm trying to save Yui!" he responds.

After several more seconds.

"Yes!"