魔女らば魔女れば

Ever since a childhood accident where Maruna Rinjou saved his life with a blood transfusion, Haruka Kuze has felt a deep sense of gratitude and a desire to repay her. But Maruna, now a fiery and determined girl, seems to want nothing to do with him—or so he thinks. When Haruka discovers that Maruna is a "witch's egg," struggling to wield magic on her own, he decides to help her achieve her dream of attending the prestigious Sacred Witch Academy. There's just one problem: it's an all-girls school, and Haruka must go to great lengths to support her. (Unreviewed summary by Grok 2)