Looking for blond hair girl with pink dragon tail anime I only know very little about the anime but I would like to finish it.

Here's what I know:


The main character is a little girl with long blonde hair and she has a pink dragon tail with a heart on the end.
Their is also a guy with blue or black hair who has a daughter, and they are both from the human world.
And I think the only way to get to the magical world is through a tree in the middle of a lake.


And that is really all I know and I would love for someone to help me identify this anime.
I believe you're talking about Astarotte Ygvar:


Astarotte no Omocha!

Synopsis

While job hunting, Naoya is taken by a mysterious girl to a magical land where he is installed in the harem of the succubus Princess Lotte. Thanks to trauma from her childhood, Lotte hates men and surrounds herself with lots of other women, who all have quirks of their own. In spite of her selfishness, when Naoya learns that Lotte is really quite lonely he agrees to stay in her world ...if he can bring his daughter Asuha with him.

Source: ANN