Tasuku pieces together the surprising connections between Chiaki and Keita. Chiaki and Keita, meanwhile, not even aware that they'd had those connections, discover that they have some seemingly irreconcilable differences.
you might invite them 
as a matter of courtesy.
.فقد أدعوه من باب المجاملة
magari lo inviti per cortesia...
talvez eu o convidaria por educação.