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...
Loving to observe plants and animals and 
their interactions with their environment,
حبّ مراقبة النباتات والحيوانات وتفاعلهم مع محيطهم
Die Liebe zur Beobachtung von Tieren
und Pflanzen und ihrer Interaktion in der Umwelt
Observar plantas y animales
en su entorno
Observar plantas y animales
en su entorno
Si tu aimes observer
les animaux et les plantes,
Se ami osservare piante e animali
e come interagiscono con l'ambiente
Apreciar a interação de plantas
e animais com o ambiente
Твоя любовь к наблюдениям 
за природными явлениями