Was Natsuki's first love, Atri? His beautiful childhood memories are gradually being overwritten. Despite his unwillingness to admit it was her the facts around him are lining up to force him to, but he continues to deny it. 
I've never been human before, 
so I'm not entirely certain...
لم أكن بشريّة من قبل، لذا
...لستُ مُتيقّنة
No estoy segura,
porque nunca he sido humana.
No estoy segura,
porque nunca he sido humana.
Je ne suis pas un être humain,
alors je m’avance peut-être,
Non sono mai stata un essere umano,
Nunca fui um ser humano,
então não tenho certeza.
Я не была человеком,
так что не могу знать наверняка…