そくたつゆうびん
special delivery mail; express delivery post
Noun
三月さんがつ三さん日ひの午うまごろに、一通いっつうの速達郵便そくたつゆうびんがわたしの家いえの玄関げんかんに投なげ込こまれた。
On the 3rd of March, at around noon, an express letter was thrown into the entrance of my house.