>>85269616Two reasons: 1: Cthulhu Mythos is once removed from them culturally, so it's interesting and novel. In the same way we have a bunch of people fascinated by youkai and spirits and and samurai and feudal japan, Japan would naturally be interested in bespectacled investigators in smoggy european villages or detectives with revolvers chasing strange cults
2: Japan likes scene-writing games. If you've seen a bunch of JP RPGs that have been published, they like games that have dice tell you what your character is supposed to feel or value and then play that out as best as possible (as opposed to a lot of western RPGs that focus on overcoming challenges through combat, rolls and roleplay, with your motivations and goals being yours to supply and often ancillary to the session by session goals). CoC isn't QUITE like that, but it involves a lot of "do something, see what happens, your character now has a phobia, your character runs screaming into the night, etc" which fits that feeling nicely. Not only that, it's both a great setting and system for replays, which is another thing they like a lot.
In short: It's horror roleplaying that is often unexpected and exciting in an unfamiliar cultural setting.