Since this word is made up of a single kanji, it should use the kun'yomi reading. When learning the kanji, you didn't learn that reading, so here's a mnemonic to help you with this word:
Who's your buddy? It's Kimmy (きみ)! If you know a Kimmy, imagine her. If you don't, find a famous Kimmy or make up a Kimmy to imagine. You ask... is it you?? Wait, you're my buddy?
You and I will always be together.
You're pretty short, so I'm worried if you'll be able to reach the shower head and take it off the hook.
You are the worst person to be stuck with in an elevator.