How do I unlock rank 4 parts for the Jagd Doga (Gyunei)?

Unlock and clear the "Fighting Heart" Extra Mission. To unlock the mission, you must clear Gyunei Guss's Story Mode and max out your relationship with Gyunei. More.

Unlock and clear the "Captive Princess" Extra Mission. To unlock the mission, you must max out your relationship with Quess Paraya and have fully assembled the Jagd Doga (Gyunei). Note that the mission is restricted to single-player only, and you must pilot the Jagd Doga (Gyunei).

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