Sunshine, S2E2, about 5 minute mark, after showing how Chika is struggling with lyrics, but right before pointing out Ruby is good at sewing, and then Mari pointing out they should split up 2nd years from 1st+3rd on their tasks
A is for aye aye- And you(you, not that youchan;the you that talk you!:-) ]- shuutinguu next time if u are trying to make chika on jealous and for not proper read her name like English people,properly