I'm Gonna Be An Angel

Hearts Have Wings and Stuff (1x6)

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Because she wants to be Yuusuke's angel, Noelle starts her flying attempts, with the help of mechanical wings built by her sister Lucca. We see through flashback Natsumi's traumatizing memory of losing her older brother, Fuyuki. She's bitter about his death and is very annoyed with Noelle for endlessly talking about angels, but still Noelle follows her around and demands that Natsumi teach her how to fly. She goes to the diving team with Natsumi and attempts to dive off the high diving board the way Natsumi does. After all, Yuusuke said Natsumi was an angel, and every morning he watches her "fly" off the diving board.