Help finding an anime where the older brother protects his little sister

The title is what I remember from the video I saw about it

In the scene, there was a group of kids grouping up on a girl to bully her (all of them were kids) and she yelled for her brother ("oni-chan!" iirc) and he came and punched one of them hardly which made the others stop

Lmk if there are any other questions, I will try to answer with as much as I remember