He was a wealthy scion of an elite corporation. She was a martial arts master who was hired as a robot maid bodyguard. She's still human, he just...doesn't know that. And now that she's fallen head over heels for the lonely boy, hiding her feelings has become a Herculean task! Especially now with Arthur doting on her while they're vacationing at a summer island and fighting would be assassins who already know her secret...