Masachika is having trouble studying for exams until Alya decides to wager a favor on how well he does. When Alya discovers she wasn't invited to celebrate Masachika's birthday, she spends several days questioning just how close they actually are.
Is it commonplace for people to have 
birthday parties in Russia?
من الشّائع للنّاس في روسيا أن يُقيموا
حفلات عيد ميلاد؟
Mi stai dicendo che in Russia è normale
organizzare una festa per il proprio compleanno?
É comum as pessoas fazerem
festas de aniversário na Rússia?