A anime from 2000s idont know I don't know anything else

There was an anime movie in which a boy’s parents have a disagreement, then his father leaves him, this boy lives with his mother, then when he goes to school, a calm person with golden hair comes to his teacher. There were two bullies in the school, these bullies force the boy. And they take him hostage in a dark place and tie his hands and feet. After a while, the boy with golden hair, who had just come to their school, comes and saves him. Then they drink together on a chair. After a while, the boy realizes who has golden hair He had and saved her. She is a kind of witch and can open a portal to other worlds. He follows him and enters a strange world where he meets a young frog-like creature with green skin… please help me to find this anime.

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would you be able to identify the frog if you saw it again?
https://www.anime-planet.com/characters/tags/frogs?page=1

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