When Himuro finds out that her junior in the Ikeda lab, Kosuke, has spent over 220 thousand yen on his beloved Aika and holds her every night when he goes to sleep, she is shaken by the realization that the only present she's ever given Yukimura is a notebook, and that she's never held him while she slept. She worries that she can't objectively call what she feels "love." As Yukimura and Himuro endlessly debate "love" using numbers, Kanade proposes that the two of them go on a date, but...
Her name is Aika. My lover who 
lives in a far, distant world.
إنها تدعى آيكا. حبيبتي التي تعيش
 .في عالم بعيد للغاية
Sie heißt Aika. Sie ist mein Herz
und lebt in einer weit entfernten Welt.
Se llama Aika.
Vive en un mundo distante.
Se llama Aika.
Vive en un mundo lejano.
Aika, une fille d’un autre monde.
Si chiama Aika. È la mia amata
che vive in un mondo molto lontano.
Seu nome é Aika. Minha amada
que vive num mundo distante.
Её зовут Айка. 
Моя любимая живёт далеко отсюда.