冷蔵庫に残った最後のアイス賭けたじゃんけんに勝利し得意げに兄に見せつけながら頬張る系の妹（水泳好き）の落書きです。

Doodle of a kind of little sister (likes swimming) who beat her brother at rock-paper-scissors for the last ice cream in the fridge and is arrogantly showing off in front of him and stuffing her cheeks.