The Children's Day

Guess who did this?
これ、誰の仕業でしょうか？

Of course, "him."
勿論、この方です。

May 5 is the Children's Day and we have such fish called "koi (koi-nobori)" for the ornament. Well, it's for dog's one though.
５月５日はこどもの日で、「鯉」と呼ばれるこのような飾りをします。ま、これはワンコ用ですけど。