Delta Green is a tabletop rpg of modern times where government agents have to deal with the Cthulhu mythos and conspiracies
the more expensive “Handler Megacollection” level-up offer, among other books/campaign also comes with the 2021 Kickstarter’s update to the original rpg source book “The Conspiracy”.
Possibly consider googling tcho-tcho in delta green before picking this up
http://fairfieldproject.wikidot.com/tcho-tcho