Ultimate Great Detective. Furthermore, I simply didn't have enough evidence to refute Kurosaki's reasoning that it was a willful murder-suicide. If there had been any sort of clue there was a "mind-control poison" I would have.

Perhaps Furudo Erika's killer is a friend of Dazai-san's. Perhaps you'd think "He deserves to live." Perhaps, hearing who it is, you decide to give stupid clues via the message system that distract from, rather than lead to, that person. ...I would really rather you didn't.