第7話: 写真記憶を持つ天才画家が殺害され、死に際に白いジグソーパズルを残した

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The group visits a friend of Katagiri, who is a splendid artist. It turns out that he too has the same ability as Megu, of photographic memory. Unfortunately, he is killed and the dying message is a 5000 piece solid white puzzle that only Megu can solve thanks to her photographic memory. (Source: Wikipedia)