Sorry this took a while, it was quite long :oooo:
And there we have it, as it turns out it wasn't only Jack that has an alter ego!
If you look at the volume art, the guy grabbing Anri in the third volume art should be the legendary detective but... we didn't get a fourth volume...:qq:
This chapter's title in Japanese has wordplay: ジャックの弱点 (Jakku no Jakuten), Jack's Weakness. I couldn't think of equivalent of that in Eng so I just translated it straight. While I did that translation straight, this chapter on the other hand, is full of .