Home world: Planet Earth (Heisei Seven Universe)
First appearance: Heisei Ultraseven episode 4: "Consequences of a Promise"
Latest appearance: None
Height: 61 m
Weight: 50,000 t
Category: Kaiju
Affiliation: None
Roar(s): TBA

Dairyuhkai (大龍海ダイリュウカイ Dairyuukai? Great Sea Dragon) was a kaiju that appears in the TV Series: Heisei Ultraseven.

Subtitle: Space-Time Monster (時空怪獣 Jikū Kaijū?)


  • Height: 61 m
  • Weight: 50,000 t
  • Origin: Pacific Ocean


Heisei Ultraseven

Said to be the sister of Otohime, Dairyuhkai was the protector of Otohime. When Urashima Taro broke his promise with Otohime, Dairyuhkai emerged from a tornado and destroyed Ryunomiya city. For this act she was abandoned by her sister who was completely disappointed with her.

Three hundred years later she returned to find Taro and claim her vengeance. She was stopped by Ultraseven who attempted to held her of, even with his Eyeslugger which she caught and threw away. It was only when Taro, now an old man offered up a rose, showing that he had kept his promise, that she relented disappearing in a golden light.


  • Suit Actor: Fujimoto Kotaro
  • Dairyuhkai is one of the few monsters to fight an Ultra and not be defeated nor defeat said Ultra since their fight was not completed.
  • Despite being listed as a Kaiju, Dairyuhkai is actually clearly sentient, given her motivations and the fact she spoke to Seven.

Powers and ​Weapons​

  • Tornado: Dairyuhkai can create or emerge from a tornado.
  • Blast Cannons: Daiyruhkai can fire several missile-like blasts from his mouth at once.
  • Smokescreen: When needed, Daiyruhkai can emit a steady stream of blinding mist from his mouth.
  • Telepathy: Dairyuhkai can talk to others telepathically.


Ultraseven Kaiju & Seijin
Ultraseven Windom | Alien Cool | Alien Waiell | Human Organism X | Alien Pitt | Eleking | Miclas | Alien Godola | Alien Bira | Alien Pegassa | Alien Quraso | Alien Metron | Alien Chibu | Zero One | Alien Icarus | Alien Wild | Nurse | Alien Spell | Alien Iyros | King Joe | Alien Pedan | Annon | U-Tom | Alien Bell | Blood-Sucking Acari | Gumonga | Suflan | Alien Bado | Alien Shaplay | Giradorus | Iron Rocks | Alien Mimy | Alien Braco | Gabura | Alien Shadow | Alien Kanan | Gandar | Alien Poll | Star Bem Gyeron | Alien Borg | Dinosaur Tank | Alien Kill | Alien Prote | Alien Plachiku | Darii | Rigger | Agira | Shadowman | Alien Uley | Dancan | Petero | Alien Zamppa | Alien Pega | Alien Magellan | Alien Banda | Crazygon | Alien Guts | Aron | Tepeto | Alien Tepeto | Guyros | Nonmalt | Robot Chief | Robot Commissioner | People of the Fourth Planet | Alien Goron | Gorry | Alien Perolynga | Alien Salome | Robot Ultraseven | Alien Hook | Pandon | Reconstructed Pandon | Alien Ghos
Alien Pitt | Eleking III | Alien Metron | Dinosaur | Alien Viyell | Alien Guts | Sulfas | Banderas | Alien Valkryie | Daitekkai | Alien Galo | Alien Kyuloo | Alien Remojo | Bolajo | Dairyuhkai | King Joe II | Nonmalt | Zabangi | Disk Dragon | Alien Pegassa | Alien Godola | Neo Pandon | Alien Garut | Plant Life form | Gaimos
Ultraseven X Galkimes | Alien Makindo | Peginera | Alien Vo-Da | Alien Chamuda | The Soul of Light | Alien Vairo | Vadoryudo | Hupnath | Jyuujin | Saku | Grakyess |Mecha Grakyess

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