Anime title plz help ?

This anime just remembered want to watch it again 

Bout this school where I think monster coexist main actor falls in love with girl who transparent I think the one of girl in school who does not talk but only communicate with words across head when they ask her question... she go thru wall i mean literally become one with wall and floor

Mother of girl she does not eat but become transparent to keep her daughter from not

All I remember one episode she become full transparent 

Any idea 

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