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...
And what proof leads you to determine 
that you love this Aika?
وما هو الدليل الذي يثبت لك 
وقوعك في حبّ آيكا؟
Und was veranlasst dich zu der Annahme, dass
es Liebe ist, die du bezüglich dieser Aika spürst?
¿Y qué prueba tienes
para determinar que la amas?
¿Y qué pruebas tienes
que demuestren que la quieres?
E quali prove ti hanno portato a stabilire
che sei innamorato di questa Aika?
E que provas o fizeram
acreditar que ama essa Aika?
На основании каких признаков 
ты решил, что влюблён в Айку?