A rich man learns of a treasure in a swamp and forces his servants to drain it. Tatsuko goes to a shrine in the mountain every night seeking eternal beauty. The black dragon, who is the master of a huge swamp, wants to marry the beautiful Kurohime.
Every day after that, 
they searched the swamp, but...
Día tras día, trabajaron 
en medio del pantano,
Día tras día, trabajaban 
en el pantano,
Todos os dias, eles procuraram, mas...