After-School Bitchcraft Vol. 1 (manga)

Ririka Kirise's a style-savvy high school girl who's struggling to keep up in her chemistry class. Looking for some extra help, she opens the door to her teacher's office-breaking his magic barrier in the process! Unbeknownst to Ririka, Renji is actually a sorcerer...and Ririka has the makings of a sorceress herself. Before she knows it, she's wrapped up in the world of witchcraft as Renji's apprentice-and getting into some sticky situations...