Casual
友達・家族
Friends & family
Close relationships where formality would feel stiff or distant.
Polite
職場の同僚・店員
Colleagues & strangers
Default safe register for most adult situations.
Formal Keigo
上司・取引先
Superiors & business partners
Required in formal business communication and official correspondence.
Ultra-formal
初対面のお客様・式典
Customers & ceremonies
Used by service staff, hotels, airlines, and in ceremonial contexts.