Whilst Kaito is having a picnic with Jin and Nonoha, Raetsel appears before Kaito, stating that the Fool's Puzzles made Jin suffer, clashing with Kaito's own memories of him. However, Nonoha helps them realise there are some memories of Jin that they both share. Meanwhile, a Master Brain named Dr. Theorem appears before Cubik, who decides to face him in a puzzle to prevent him from reaching Kaito. Cubik is tasked with finding 'the most beautiful number' within 15 minutes before he is engulfed in flames...