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Conan is back home at Mouri Detective Agency. Kogoro is on the phone with Ran but suddenly got shocked that Ran is going to sleep over at school during night time because everyone's going to practice karate.
The Detective Boys stall for time while trying to discover the truth about Masao's parents without alerting them.
With poison only on the victim's thumb and forefinger, the case becomes confusing. What evidence in the victim's possession will lead them to the culprit?