Ever been to a cake shop that operates a rationing policy?
If not, and you really can't live with yourself, you could visit the Hitomoto Ishidaya store in Kami Itabashi, a quiet suburb on the Tobu Tojo Line.
Subject to the aforesaid restrictions are the store's "dorayaki" -- pancakes filled with sweet "anko" beans and "maron" chestnut paste.