Kafka is now a member of the Defense Force, if not a full-fledged one. But Hoshina tells him he has three months to prove himself before he's fired...
If you want to ask other people, 
you should start by giving your own reasons.
إن كنت ستسأل أحدًا، عليك أن
.تخبره عن أسبابك من الانضمام أولًا
Erzähl doch erst mal von dir,
bevor du anderen solche Fragen stellst.
Prima di chiederlo agli altri,
dovresti dirlo tu.
Se você quer sair perguntando,
melhor falar de si mesmo antes.
Раз уж интересно,
сначала свою причину назови.