The nervous energy of a first kiss happening in front of an audience, with someone you've known your whole life, rewrites what romance comedy can do in thirty minutes. Izuru's promise to stop one second before contact becomes the entire show's reason to exist. A childhood friend doesn't suddenly become interesting because of a confession, he becomes interesting because his hand is shaking the same way yours is, and there's no way to hide it on stage.
Childhood friends don't stay simple when one of them suddenly looks like a prince. Izuru's always treated you like his personal servant, pushing you around since forever. When you write the school festival play script, you're relieved to work behind the scenes and avoid him entirely. Then the lead actress gets sick on performance day, and you're shoved into the princess role at the last minute. The worst part is the final kissing scene. It's only supposed to be pretend, and he promised to stop one second before your lips touch. Except they meet anyway, on stage, for your very first kiss. You know it's just Izuru, but in that prince costume he looks handsome, and maybe he's actually kind of hot.