racially pure Japanese person
Refers to a person of unmixed Japanese ancestry, often used in discussions of ethnicity or identity. Can carry a slightly formal or analytical tone.
He is a racially pure Japanese person, but since he grew up abroad, he struggles with Japanese.
Not only pure Japanese people but also people with various roots live in this area.
Compound of 純 (pure) + 日本人 (Japanese person). The exact origin is uncertain, but it likely emerged in modern contexts discussing ethnic identity.