Kindaichi Shounen no Jikenbo Gaiden: Hannin-tachi no Jikenbo

Kindaichi Shounen no Jikenbo Gaiden: Hannin-tachi no Jikenbo summary:

Threatening Notes. Locked Rooms. Impossible Murders.
We’ve seen detectives solve them all, but how did they come about in the first place?
How does a culprit check into a hotel without taking off his mask?
How much does it cost to set up an elaborate trick?
What’s the right font to use while writing a scary message?
Presenting all these and more, in a hilarious retelling of the best Kindaichi stories, but this time, from the culprit’s point of view! Can the culprit successfully pull of his crimes with the young detective watching on?