Work Hard! Valentine's Day

'''Work Hard! Valentine's Day' (勤勉！ばれんたいんでー, Kinben! Barentaindē) is the fifth episode of the second season of Isekai Quartet'' and seventeenth episode of the full series overall.

Summary
It's Valentine's Day, which means it's time to give chocolate to the boy you like! But an unexpected face makes an appearance…

Trivia

 * Darkness references her fight with Kazuma back in Konosuba.
 * This is the second Isekai Quartet episode that has a special holiday ending song.