so I was wandering if any of you might be able to help me find this one anime. I don't remember it perfectly anymore but I try to describe it as best as I can.
So there is a girl with some kind of magical power (or maybe a vampire or something like that) and she is sealed inside a cube-like sphere. There is also a boy with whom she made a contract/formed a bond? They fought together and at some point got defeated. That is when the girl actually got sealed and the memory of the boy removed, so he doesn't remember her. But the sealed girl is waiting for him to free her and since boy's memory wasn't removed completely he starts to remember about her and frees her.
If i remember correctly this was just the start of the anime and it then really begins, but it could also be a second season, i really don't know...
I hope someone can help me with a name, I'm looking for that anime so badly.
In case this is the wrong section for my thread I apologize in advance and beg of you to move it to the right one.
EDIT: I remembered one more thing. They formed their contract/bond on a playground and I think on that same playground happened the fight that they lost.
Thanks and bye