本格（風）学園ミステリー、ここに誕生！
しんのすけたちは風間くんの誘いで
全寮制の超エリート校「私立天下統一カスカベ学園」、通称・天カス学園に1週間体験入学することに！
学園で多発する怪事件に巻き込まれ、風間くんがおバカに？！
事件の真相を解明すべく、しんのすけたちは「カスカベ探偵倶楽部」をケッ成!
しんのすけたちが迷推理の先に見つけたモノとはー
An authentic (style) school mystery is born here! At Kazama-kun's invitation, Shinnosuke and his friends decide to enroll in the super elite boarding school ``Private Tenka Unification Kasukabe Gakuen'', commonly known as Tenkasu Gakuen, for a week! Has Kazama-kun turned into an idiot after getting caught up in the mysterious incidents that occur frequently at the school? ! In order to uncover the truth of the incident, Shinnosuke and his friends set up the "Kasukabe Detective Club"! What did Shinnosuke and his friends discover through their stray deductions?
