【何の絵を描いてるか他の子が当てるまで頭上で膨らみ続ける風船を怖がりながら必死に描く海未ちゃん】
お題箱より

From the topic box:
"Umi draws desperately, all the time fearing the balloon over her head that continues to inflate until the other girls correctly guess what she's drawing."