Because Souma said that Noboru was his middle school friend... But then the flashback shows that Noboru was in Hayato's middle school...? And Hayato and Souma went to different middle schools as far as I recall...
Ops sry vor the thumbs down, it was an accident =_=' Maybe noboru transfered to another middle schloo after "that". And he met souma there.. idk though(〜 ̄△ ̄)〜
Because Souma said that Noboru was his middle school friend... But then the flashback shows that Noboru was in Hayato's middle school...? And Hayato and Souma went to different middle schools as far as I recall...