Help me find one anime please

When I was 8-10 years old, 2013-2015, my mom bought me DVD disc from old shop, it was anime, well that time I didn’t even know what is anime. It was about some guy entering to some school, and one girl falls in love with him, I think she had brown not long hair. And there was another girl taller, purple or blue hair, and she worked as waitress i think, she also was some sort of killer or had super powers idk, and both of them loved that guy. The guy had glasses.
I know most of old animes is like this, and it’s almost impossible to find but still thank you. Also I watched it more than 10 years ago so a lot of things I can’t remember or remember wrong. So some descriptions might be wrong