As the final drill concluded, Hiiragi collapsed, not out of exhaustion, but out of completion.
The addition of "-Final-" indicates a conclusive entry or phase in the diary, suggesting a climax, resolution, or significant moment in the story. Lastly, "-K-DRIVE--" could imply a specific program, initiative, or perhaps a metaphorical or literal drive or motivation that plays a crucial role in the story. Hiiragi-s Practice Diary -Final- -K-DRIVE--