Home world: Yapool's dimension
First Appearance: Ultraman Ace Episode 17: Summer of Horror Series - Ghost Story! The She-Devil of Firefly Field
Latest Appearance: None
Height: 80 cm ~ 72.2 m
Weight: 90 g ~ 23,000 t
Category: Choju
Affiliation: None
Roar(s): TBA

Hotarunga (ホタルンガ, Hotarunga) was a choju that appeared in Ultraman Ace, episode 17.

Subtitle: Large Firefly Super-beast (大蛍超獣, Dai Hotaru Chōjū)


  • Height: 80 cm ~ 72.2 m
  • Weight: 90 g ~ 23,000 t
  • Origin: Yapool's dimension → Firefly Gahara


Ultraman Ace

A girl named Damiko was approached by Yapool, who promised her that she would see her mother. She was then hired to become the She-Devil. TAC wondered if this act was to stop their V7 missile plan. The fireflies which appeared to weaken Houkuto and Minami were drawn by the She-Devil. Minami befriended Damiko and tried to watch over the paraplegic girl. One night, Minami was suffering under the fireflies. Minami broke the bond between the She-Devil and Damiko. Damiko was able to walk and told Minami that Yapool can let her see her mother. Yapool told Hotarunga to come to his orignal size and stop TAC's V7 plan. Hotarunga did so and sucked Damiko and Minami in his abdomen. TAC saw Hotarunga and began attacking. After TAC sprayed a gas on Hotarunga, he ejected Minami and Damiko. Hokuto and Minami became Ultraman Ace and decided to fight Hotarunga. The acid that the choju sprayed seemed to take effect at first, but Ace managed to get the upper hand. After a lengthy battle, the TAC fired their missile straight at the giant firefly's forehead. Hotarunga was finished off by Ace's Metalium Beam.


  • Hotarunga has a modified Antlar roar.
  • "Hotaru" means "firefly" in Japanese, which is fitting considering this choju's default form.

Powers and Abilities

  • Thorax Flashes: Hotarunga can emit flashes from his thorax that blind and stun opponents for a short period of time.
  • Acidic Mist: Hotarunga can emit acidic mist from the hole on his head. This mist can be highly explosive and can cause suffocation.


Ultraman Ace Kaiju & Seijin
Verokron | Yapool | Chameleking | Vakishim | Garan | Aribunta | Giron Man | Brocken | Alien Metron.Jr | Doragory | Muruchi II | Gammas | Zaigon | Alien Antira | Unitang | Sabotendar | Barabba | Ace Killer | King Crab | Cattle God | Cowra | She-Devil | Hotarunga | Black Pigeon | Android Couple | King Kappa | Zemistlar | Aprasar | Aprasar Fairy | Space Mask | Black Satan | Giant Yapool | Mazaron Man | Yojo | Mazarius | Alien Orion | Sphinx | Alien Hipporito | Lunaticks | Undergroundmon | Gitagitanga | Red Jack | Baktari | Coakes | Bad Baalon | Kaiteigagan | Dreamgillas | Soundgillar | Machless | Snowgiran | Namahage | Alien Fire | Firemons | Alien Steal | Kaimanda | Shishigoran | Iceron | Woo II | Fubigirara | Onidevil | Gasegon | Daidarahoshi | Hanzagiran | Verokron II | Yapool Woman | Univerlages | Aquarius | Alien Revole | Signalion | Geegon | Alien Simon | Jumbo King