The story According to Shonen Sunday News:

少年探偵団に届いた、「ワシを助けてくれ」と書かれた手紙。それは阿笠博士がコナンらに仕掛けたゲームだった。ところが、その謎を解いたコナンたちを待っていたのは…!?

The Detective Boys received a "Save Me" letter. The letter was a game from Professor Agasa to challenge them. However, when the detective boys solved the mystery, something unexpected was waiting for them.

Professor Agasa suddenly becomes in danger

The professor & Detective Boys face each other in deducation