Otonari no Tenshi-sama ni Itsu no Ma ni ka Dame Ningen ni Sareteita Ken - Vol. 5 Ch. 18.1

[Narf]

From what I gather, it seems to be an older tradition that has faded in popularity in recent times - along with White Day in general.

Huh, interesting. So White Day is on the way out, at least kinda? Good riddance. Is valentines seeing a decline in popularity too, or is that one still unchanged?