Watashi no Ookami Ouji

Claudia, the eldest daughter of the Rosenheim family, and Issac, the eldest son of the Lampertz family, are childhood friends who have been bickering ever since they were children. Whenever they see each other, they fight and argue… but they have skipped the “enemies to lovers” part of the story, and go directly to “engaged to marry” instead! It's because Claudia's magical powers are going out of control, but how will Issac help her…!? (Source: 7iro Comics, translated)