The Mansion of Death and the Red Wall (Empty Fort Strategy)

Komei regains consciousness, together they conclude that they lack the evidence to capture the culprit and thus decide to use the Empty Fort Strategy to lure the culprit out. Using the strategy to lure the culprit out, they created the sense that no officers are guarding Naoki's apartment and successfully lure Naoki Midorikawa.

Synopsis excerpt via Kitsu.