Episode 799: Detective Boys' Locked Room Mystery Battle
Scenario: When Professor Agasa unlocks the grounds of a building site for the Detective Boys to play soccer, he finds a body floating in a pool that's filled with water from last night's rain.
One morning, the Detective Boys are on their way to an abandoned building lot which Professor Agasa has managed to loan from a wealthy acquaintance, in order to practice their soccer skills for an upcoming school match. The lot is located next to an eight-story building, and was formerly the site of a mansion which is already torn down, with only a family-sized pool and a shed remaining. However, when they arrive at the lot, they find the grounds crowded by the police: A body has been found in the pool.
When Professor Agasa unlocks the grounds for the children, he finds the body floating in the pool, filled with water from last night's rain. While the cause of death is known, the questions as to how and why "Gecko" has come to rest inside the locked-down lot, and who might have murdered him, are yet to be found out.
Since the ground is a crime scene, the police has close it off until the case is solved. Megure jokely suggests that the detective boys should try solve this mystery, but the kids takes up the challenge.