Housekeeping Mage from Another World: Making Your Adventures Feel Like Home! (Manga) Vol 8

On the day before a famed songstress's performance at the highly anticipated Nativity Festival, disaster strikes and half of her orchestra falls ill. Shiori is called in to help support the concert with her illusion magic, but it soon becomes clear that nefarious forces may be at work behind the scenes. As sabotage, poison, jealous rivals, and other dangers rear their ugly heads, Shiori realizes that in offering a helping hand, she might have made herself a target...