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. 
When I sang that song,
that vision popped into my head,
عندما غنّيتُ تلك الأغنية، لمعت
،تِلك الرّؤية في رأسي
Als ich das Lied sang, kam nur
diese eine Erinnerung wieder hoch …
Al cantar la canción,
esa escena resurgió en mi memoria.
Al cantar la canción,
esa escena resurgió en mi memoria.
Cette image m’est revenue en mémoire
quand j’ai chanté la chanson.
Cantando quella canzone,
 mi è tornata in mente questa scena.
Quando cantei a música, apenas essa
cena veio à minha memória.
Когда я спела песню,
в голове возник этот образ.