It's also all the more reason we're keeping this a secret between a small number of folks- your father and Sholmes may tell whoever they trust to keep the secret, and I do the same. Outside of that? [Well, it really was for the best not to let it get out; both so it never reached Reaper and... to keep people from going down there and destroying the peace, one way or another.

He trusted Eustace, and the one he would tell. Knew that both Kazuma and Susato would keep a secret as well.]

Sounds like a good plan, too.