I loved this episode. A good mystery that's solved within the episode is always welcome. It reminds me of the early episodes of "Case Closed" (back when the criminals didn't have engineering degrees). The explanations for the deductions sound quite convincing, and Rampo really comes across as a competent detective. Dazai is no slouch either; in this episode, they both establish themselves as highly intelligent. Furthermore, the case has a good dose of drama, which I personally love.