I pronounce TWEWY kind of flat, without any emphasis, like I do with any sentence-like title. Speaking of which, how are you supposed to pronounce "Monster Kingdom Jewel Summoner"? I mean, at least not without a degree of embarassment.
I'd just pronounce the acronym. Twoo-whee. Wuve, twue wuve... actually, I might pronounce it The World ENDS With You. But it's a lame title anyway. Which makes it funny.
uh, Monster Kingdom Jewel Summoner? No clue. Er, Smash Bros. Melee went through my mind... Mon-ster-king-dom JEEEEEEEEEEEEWEL SUMMONEEEEEEERRRRR!!!
I'd just say "Monster Kingdom", "Monster Kingdom blah-blah-blah", or the acronym MKJS.
MKJS... Mortal Kombat: Johnny's Screwed. You know, Johnny Cage, he... yeah, whatever.