Dig about the same number of holes, fill them with about the same amount of dirt.
Drag things out about the same amount, fish around about the same amount.
Come up with about the same wild ideas and accidentally hit the same tropes. Have about the same number of readers: none.
Your more or less average author.
Warnings:
1. Lots of melodrama and out-of-character behavior.
2. The heroine is a witch from ancient Europe, very weak, and an expert at running away.
3. The pairing is tentatively with the eldest. If things go off the rails later, it'll be the eldest > Nanami > Fushiguro > Mahito.
4. Some of the worldbuilding is inspired by Harry Potter.
5. Please don't attack the author too hard.
Theme: Think twice before you act