During which phase of meiosis II do chromosomes begin to de-condense?

In meiosis II, chromosomes begin to de-condense during telophase. This phase follows anaphase, when sister chromatids are pulled apart to opposite poles of the cell. As the telophase progresses, the chromatids reach the poles, and a nuclear envelope starts to form around each set. During this process, the chromosomes, which are initially tightly packed, start to unwind and de-condense back into chromatin. This de-condensation is crucial for the eventual stage where the cell can move into cytokinesis and ultimately prepare for subsequent cellular processes.

Telophase marks a transition point where the genetic material is no longer in a highly condensed form, which is necessary for proper gene expression and cell function going forward.