This was definitely a costume choice I didn't expect after the previous birthday (post #9464046), because Shiori also had a Rapunzel cut costume according to the bonus memorial booklet (not really a completely new costume compared to the Yuyuko one, since there were Junna and Aruru already with that role...), so the artist choose the Beauty probably due to the fact that the next reading theater featuring the Edels that will perform this July is about that fairy tale.