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. 
Yes. Something about proving 
that something wasn't me...
...أجل. حول إثبات بأنّني لم أكن أنا
Ja … Ich solle beweisen,
dass ich nicht ich sei und so …
Oui.
Sì.
Sim. Ele ficou falando sobre provar
que não era eu ou algo assim...
Да. Всё повторял,
что докажет, будто я — это не я.