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:
Your younger sister is really into emotes (いもうと). Look up this word if you're not a teenage girl. Just imagine her sending you these on your phone over and over. You tell your younger sister: "HEY, STOP SENDING ME EMOTES."
Who is Tanaka’s younger sister?
I feel betrayed by my little sister.
My younger sister just cut off all of her hair so she could make wigs for her Barbie dolls.