Ultimate Kaiju system

A kid who cleans up kaiju guts but then gains the power of one!!!! Badass am I'm I right!? No, but seriously, an average boy named Rowan is drafted into the great kaiju war where he must fight off the giant mysterious alien-like creatures which are invading the land. However, he isn't suited to be a soldier, so he is part of the cleanup crew instead until one day he gets a mysterious power allowing him to summon kaijus, level up, and do quests which strengthens him and his Kaijus.