Question: Which Harry Potter film was #2 when Kamen Rider Decade: All Riders vs. Dai-Shocker opened at the #1 spot?
Sentence (from "Harry Potter and the Half-Blood Prince (film)"): The story follows Harry Potter's sixth year at Hogwarts as he receives a mysterious textbook, falls in love, and attempts to retrieve a memory that holds the key to Lord Voldemort's downfall.
Relevant evidence: No