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...
He sees shadows of his childhood friend 
who died in his lab partner, Yukimura-kun.
يرى خيال صديق طفولته الذي مات 
.في مختبر زميله يوكيمورا-كن
Sieht seinen verstorbenen Freund
aus Kindertagen in seinem Kollegen Yukimura.
Ve sombras de su amigo
de la infancia fallecido
Ve rasgos de su amigo
de la infancia fallecido
Il voit en Yukimura
Vede l'ombra del suo amico d'infanzia morto
nel suo compagno di laboratorio Yukimura-kun.
Ele vê sombras de um amigo de infância falecido
no colega de pesquisas, Yukimura-kun.
Он видит в коллеге по лаборатории Юкимуре
призрак своего умершего друга детства.