You Can't Bluff the Sharp-Eyed Sister Vol 2 (Rated Teen)

A shrewd, young priestess-in-training is set a murder to solve in this new mystery manga from the creator of The Apothecary Diaries! By day, Chloe lives at a convent. By night, she's such a card shark, a holy knight ends up believing she has a rare, magical gift. What he doesn't know is, she just has sharp eyes and a quick wit--which she'll need when she's uprooted and dropped in the middle of a round of deadly palace intrigue!

Chloe’s trials for the role of blessed sister continue, as she begins to get to know her fellow candidates and the special talents they may (or may not) possess. But tea parties and pastoral visits aside, Chloe must still investigate the murder that happened two years ago, despite Monique’s ominous warning. The other girls are friendly enough to Chloe, but are they truly as saintly as they seem?