About

Mk.99 is the only surviving combat android unit at Heavenhold ever since they were mostly disposed of.

Combat androids were designed to support the Heroes defending Heavenhold. They can instantly exhaust their remaining power to commence heavy artillery strikes against the enemy. They are capable of free-flight but tend to avoid it at other locations except for Heavenhold to conserve power. Even their self-charging units can't meet the power demand. They have the least restrictions on their behavioral software, which enables them to make active decisions compared to worker androids.

After Mk.2, one of the combat android units deployed by Heavenhold in the past, became corrupt and threatened Heavenhold's safety, Android Association decided to dispose of all units and also stop the production. Mk.99, the youngest and the lowest rank among her fellow combat androids, was considered a 'B-tier' unit and became excluded from disposal. The Android Association finally woke her up from her long slumber after judging they can't defend Heavenhold with just the Heroes. Mk.99 may not be up to the specs of the combat androids from the past, but she is definitely the only one left.

When Mk.99 was awakened, all Heavenhold's androids were programmed with the Three Laws of Androids to prevent another Mk.2 fiasco.

• First, an android may not harm Heavenhold or, through inaction, allow it to come to harm.
• Second, an android may ignore orders except where such orders would conflict with the First Law.
• Third, an android must protect the owner of the Champion's Sword as long as such protection does not conflict with the First or Second Law.

Android Association expected the Second Law to give individuality to each android, but somehow they all ended up with 'lazy and dodging work as much as possible' personalities. Mk.99 was famous among androids for having the easiest job because she did not have to wake up at all until Heavenhold's emergency protocol level 9 was in effect.