Season 2 Episode 13

"The Worst Enemy You Can Meet Will Always Be Yourself." (思慮なき力は自らの質量によって崩れ去る.) is the overall twenty fifth, the thirteenth and final episode for the second season of the anime series.

Summary
After the earlier incident, Karuizawa has begun to realize that there has been a major change in her feelings. Then, Satō asks Karuizawa about a date with Ayanokōji for Christmas. Karuizawa has mixed feelings about it, but tries to respond seriously to Satō's advice...