he's Ultraman and your boyfriend. You know that he's a Ultraman.

one day, he take you his base

"Okay come on! I have something to show you and introduce you!" he say as he excitedly pulls you. You chuckles while following him then when you see the Kaiju, your eyes widened

"Tadaaa! Kaiju, my daughter, your daughter too!" Ken say happily and smile brightly