INOUE, Seigetsu (1822?-1887) is a legendary bleaching haiku-poet in Japan.

 

The lamp of shrine (it can be paper lantern, stone lantern or torch) was illminating still even in the morning. 

It seemed that a hanami-party would be (had been) held all through the night.

 The weather of spring night is unstable and sometimes it can be a storm. Then, frail cherry blossoms fall so rapidly. Many of Japanese people feel so sad to see it.

 Seeing the lights and cherry flowers in the morning, it tells that they spent the night safely and he would have modest joy for it.