During June 2025, contributed to the optuna/optuna repository by focusing on code quality improvements within the visualization module. The primary effort involved refactoring the _get_y_range return statement in the _terminator_improvement visualization code, specifically simplifying tuple handling to reduce verbosity while maintaining existing behavior. This targeted change enhanced maintainability and readability, making future modifications to the visualization workflow more straightforward and reducing potential risks. The work was implemented using Python, with an emphasis on code refactoring best practices. No major bugs were addressed during this period, as the focus remained on structural improvements rather than feature expansion or bug fixes.