Story Mode Prologue - Crueltear is born

The Triggerheart System is installed during their development.

The Triggerheart System (トリガーハート システム Torigāhāto Shistemu) is the heart and soul of a Triggerheart unit where an artificial personality is implanted, along with a self-perservation mechanism.

Sometimes, the Development team can involuntarily create a bloodline link when 2 or more units are created by the same team, for instance the fact that both Crueltear and Exelica were developed by C.H.I.L.D.A.'s 7th Development Team created a strong sister-bond between the TH32 and TH60.