What is the name of this anime?

It involves a guy getting a package from his dead father and in the package is a rock thing with orbs in it that when pressed make him go to another dimension and later in the show i believe he goes to a world with elves and dragons etc i also remember a scene where the father of a girl he is friends with gets a gun thinking someone is in her room their is also a plot around a mysterious rock that gets hit with lightning when people try to take stuff from it  I tried googling everything i could about it but could not get a name 

Update:

also i think at first it makes him time travel instead of going to another world its unclear at first 

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