I'm Gonna Be An Angel!

'I'm Gonna Be An Angel!' is a 1999 fantasy anime produced by Studio Perriot, as well as a two-volume manga that follows the anime's plot. Yuusuke Kamoshita is a boy whose life takes a turn for the odd when he stumbles across a girl named Noelle in a forest who becomes infatuated with him. She and her parents from the Monster World move into his new home, changing it into a plastic-looking castle. Discovering the love letter Yuusuke wrote where he refers to a classmate he likes as an angel, Noelle tries to become an angel to win his heart.

E6: Hearts Have Wings and Stuff!
Noelle tests out a pair of mechanical wings developed by her sister Lucca, aiming to jump from a great height. Yuusuke climbs up a ladder after her, but Noelle gets swept away from the wind; she pulls an emergency cord which deploys huge safety balloons that Yuusuke's just able to grab onto to get down. They reach the ground, but Noelle is stuck upside down between the balloons, leading to Yuusuke and Noelle's family to try and free her. The problem is solved when her witch grandmother and her bird pop the balloons.