How do you overdrive kill in the 3rd birthday?

In "The 3rd Birthday," overdrive kill is executed by filling the overdrive gauge, which can be achieved by defeating enemies and performing well in combat. Once the gauge is full, you can activate overdrive by pressing the designated button during a battle. This allows Aya to unleash powerful attacks and increase her effectiveness against enemies. Timing and targeting are crucial to maximize the benefits of overdrive kills during intense encounters.