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. 
It's so sour! But good.
إنّها حامضة جدّاً! لكن لذيذة
Sauer! Aber lecker.
Qué ácido. Pero está bueno.
Qué ácido. Pero está bueno.
Ça pique, mais j’aime bien.
Com'è aspro! Però è buono.
Que azedo! Mas tá gostoso mesmo.
И правда кисло!
Но вкусно.