When Itsuki and Chitose visit Amane's apartment for a Christmas party only to discover that the angel Mahiru lives next door, they instantly become very curious about the relationship. Chitose, obsessed with cuteness, insists on becoming friends with Mahiru. The day after Christmas, Amane notices that Mahiru has a fever. Despite Mahiru's stubbornness, Amane convinces her to stay and rest in his room. When Mahiru sees Amane so diligently taking care of her as if returning the favor she did for him that one memorable day, it seems to put her at ease.
I'm thankful for things 
you don't even realize.
أنا أقدّر الأشياء الّتي لا تُدركها حتّى
Ich bin dir dankbar für Dinge,
die dir nicht einmal aufgefallen sind.
Estoy agradecida por cosas
de las que no te das cuenta.
Estoy agradecida por cosas
de las que no te das cuenta.
Tu ne sais pas
pourquoi je te remercie.
Ti sono grata per cose
 che nemmeno sai di aver fatto.
Sou grata por coisas
que você nem percebe.
Спасибо тебе за вещи, 
которых ты сам не замечаешь.