Lapis Re:LiGHTs

Tiara is setting out on her new life whether her older sister wants her to or not. Taking a coach from Bristol, she comes to Flora Girls' Academy with dreams of not only joining her old friend Rosetta, but also of entering the prestigious witch school. Much to her surprise, she's admitted almost instantly by not-at-all-suspicious headmistress Chloe, whose one directive is that Tiara join Rosetta's "group." That's fine by Tiara, and she's thrilled to meet fellow group mates Lynette, Ashley, and Lavie. But there's more going on than meets the eye, and Tiara learns the alarming truth about her admittance: all four members of her group are failing, and if they don't pass this semester, all of them will be expelled as a group – including their newest member.

(Source: Anime News Network)