Help needed to find an anime

[Cassie]

Hello everyone 

I need your help. 
So I’m looking for an anime that I like and unfortunately forgot the name of it

so basically it’s a boy (brown hair) who was raised by spiritual being all of them are invisible to human eye except to his (they also have white hair) 
One day he goes in town with his friend (spiritual being) and he find a girl, who is like his friend, in the church. The girl has white hair and red outfit.

The town is attacked and he learned that he can “fusion” with the spiritual being and then transform and use their power to fight. 
When he “fusion” with them he has white hair and white outfit with an other colour depending on the person he is “fusioning”.

That’s all I can remember and that’s why I wanted to watch it again.

If someone knows it please tell me

thanks 

[Cassie]

13 minutes ago, Soramee_ said:

is this it ?

https://myanimelist.net/anime/7592/Nurarihyon_no_Mago

Unfortunately no tho that one lols nice too