Yup, I've actually decided to cross these two, though not as...radically as some might worry. Basically I had two different ideas on how this could be done. Option One) Harry somehow discovers the energy known as Magatsui (sp?) (think up your own way for him to find out about it) and finds that, with enough of it, he can use it to literally shape the world the world in his image. This would be a light crossover and the only thing it would be taking from SMT:N would be Magatsui, the concept of 'Reason', and maybe a select few other things. After that, well just set Harry down the path to his eventual redemption/damnation and off we go. Option Two) Harry is approached by the The Child and Old Woman as well as The Old Man and Lady In Black, the Child implanting a Magatama within him turning him into a demon, and both of them attempting to use him for their own inscrutable agendas. At this point it could split, you could either have the Conception take place and have Harry follow down the path that the game took, or ignore the Conception and just have Harry with his newfound demonic powers continue on in his world towards whatever plotline you wished to whisk him away into. This would essentially be a much bigger cross between the two, if not a full crossover, and thus would include much more of the SMT:N elements. Special thanks go out to GenocideHeart for introducing me this amazing game that inspired me to come up with this, thanks man.