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Eternity Larva

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エタニティラルバ ()
Eternity Larva
Etanity Larva, Etarnity Larva

More Alternative Spellings
Eternity Larva
Eternity Larva in Hidden Star in Four Seasons
The Butterfly Fairy who Approaches God
More Character Titles

Fairy, God(?)[1]


Scattering scales


Garden of the Sun

Music Themes
Official Games
Print Works

"Come on! Get some exercise, and taste this summer heat with your whole body!"
Eternity Larva (Hidden Star in Four Seasons Stage 1)

Eternity Larva (エタニティラルバ Etanitiraruba) is a fairy embodying the growth, rebirth, and metamorphosis of insects.

General Information

Eternity appeared as the Stage 1 midboss and Boss in Hidden Star in Four Seasons.


Eternity Larva has an extremely gentle personality. Her playfulness is no different from other fairies. Whenever something is happening, she'll head over to play.

As a butterfly fairy, she greatly dislikes the cold. She is most active during the summer and becomes dormant during the winter.


Scattering scales

Her ability refers to the feature of most Lepidoptera of having scales covering their bodies and wings. The wings, head, and parts of the thorax and abdomen of butterflies and moths are covered with minute scales which give them an extraordinary variety of colors and patterns. Most scales are lamellar, or blade-like.

Eternity uses her scales as projectiles in danmaku patterns, as well as smokescreens.[2]

Controlling berserk lifeforce

An ability that Larva awakened after the Four Seasons incident. After using Clownpiece's torch to make her own lifeforce go out of control, she used it to instantly change the wintery surroundings into a summer scenery, complete of warm sun and palm trees.[3]

Character Design


Okina Matara's speculation suggests that Eternity may have been inspired by the story of the Tokoyo god. According to the Nihon Shoki, in 7th century Japan, a group of villagers formed a cult to worship an insect as the Tokoyo god (常世神, Tokoyo no Kami), or "the god of the everlasting world".[4] It is commonly believed that the insect was in fact a swallowtail caterpillar, which may explain Eternity's basis as swallowtail butterfly fairy.


Her full name is Eternity Larva (エタニティラルバ). Eternity may signify her theme of metamorphosis and rebirth, while Larva is the juvenile life stage of holometaboulous insects like moths and butterflies. Considering Eternity is probably based on Tokoyo no kami, her name is probably a reflection of her origin as said kami. The term Tokoyo itself was used to refer to a far-away place where people would live eternally in prosperity and wealth, which could mean that the name Eternity might be a refference to that "eternal" land. In the demo of Hidden Star in Four Seasons, her name was given as both Etarnity Larva in-game and Etanity Larva in the omake; both being more direct transliterations of エタニティ (eternity). These were corrected in the full version.


Eternity has peach-colored eyes and short light blue hair. She is modeled after an Asian swallowtail, having a pair of very large black and yellow wings, spotted with bits of blue and purple and a large two-pronged yellow osmeterium on her head which is a defensive organ found on all Swallowtail butterfly larvae. She wears a black shirt with black and yellow swallowtail-inspired sleeves and collar, a line of blue spots down the left side, and a large green leaf that encompasses her torso, resembling a pupa. She wears a light green skirt showing two thin irregular black rings and one ring of white spots of various alternating sizes at the edge. Eternity wears a crown of leaves atop her head. She does not wear any footwear.



Hidden Star in Four Seasons
Eternity Larva's sprite in HSiFS

Due to the incident in Hidden Star in Four Seasons, Eternity goes berserk alongside all the other fairies. Overwhelmed with power, she battles the player in the skies at the height of summer but is promptly defeated.

In Cirno's Extra Stage scenario, it is revealed that Cirno used the door on Eternity's back to re-enter Ushirodo-no-Kuni and challenge Okina Matara to a rematch. Somehow, this resulted in Cirno drawing on the power of doyou, the border between seasons, which ultimately contributed to Okina's defeat. As it was Eternity's door that led to this result, Okina speculates that Eternity may actually be a Tokoyo god, one of Okina's enemies, and wonders if it was a coincidence.


100th Black Market

In 100th Black Market, Eternity appears as the one of the 1st market bosses. Her ability card, a butterfly producing scent, can be acquired.


Visionary Fairies in Shrine

Larva appears in chapter 8 of Visionary Fairies in Shrine, where Cirno uses her to win a bug-catching competition against Sunny Milk, Luna Child, and Star Sapphire. After playing with them, Larva tells the three fairies about the events of Hidden Star in Four Seasons as Cirno explained them to her.

In chapter 9, the three fairies coincidentally find Larva's underground vacation home in the Forest of Magic, and invite her to the "Deep Winter Red-hot Fire Festival" they organized for the day after. Larva therefore goes to the festival, where she meets Clownpiece for the first time and reveals the newly acquired power of Clownpiece's torch, that after the Four Seasons incident is now able to make life force go berserk.



Eternity and Cirno are implied to have known each other before the events of Hidden Star in Four Seasons, as Eternity notices Cirno's tan before they fight to see who the summer belongs to. [5] Eternity also appears in Cirno's ending.




Spell Cards

Spell Cards
Name Translated Comments Games Stage
Total: 8
蝶符「ミニットスケールス」 Butterfly Sign "Minute Scales" HSiFS St. 1: E/N
蝶符「アゲハの鱗粉」 Butterfly Sign "Swallowtail's Scales" HSiFS St. 1: H/L
蝶符「フラッタリングサマー」 Butterfly Sign "Fluttering Summer" HSiFS St. 1: E/N
蝶符「真夏の羽ばたき」 Butterfly Sign "Midsummer Wingbeats" HSiFS
St. 1: H/L
蝶符「バタフライドリーム」 Butterfly Sign "Butterfly Dream" VD Tuesday - 2
蝶符「纏わり付く鱗粉」 Butterfly Sign "Surrounding Scales" VD Tuesday - 3
夢蝶「クレージーバタフライ」 Dream Butterfly "Crazy Butterfly" VD Wrong Sunday - 4
蝶符「デッドリーバタフライ」 Butterfly Sign "Deadly Butterfly" HBM 1st Market

Additional Information

  • When Okina Matara wonders if Eternity is actually the Tokoyo god, she states that the Tokoyo god is one of her enemies. This may allude to the fact that the cult of the Tokoyo god was brought to an end when the leader of the cult was arrested and executed by an official named Hata no Kawakatsu.[4] Later, Hata no Kawakatsu would occasionally be equated with Matara-jin due to their similar divine natures as gods of the performing arts.
  • Eternity Larva appears on the demo CD cover of Hidden Star in Four Seasons.


Official Profiles

Hidden Star in Four Seasons trial - omake.txt
Eternity Larva  ○1面ボス  神に近づく蝶の妖精

  Eternity Larva





Stage 1 Boss: The Butterfly Fairy who Approaches God

Eternity Larva

Species: Fairy
Ability: Capable of scattering scales

A swallowtail butterfly fairy.
But with that said, she doesn't just embody grown butterflies, but also caterpillars and chrysalids;
she can be said to be a fairy embodying insect growth, rebirth, and metamorphosis.

Like Cirno, she's stronger than usual due to some strange force. She's in berserk mode, basically.
Fairies typically go berserk during most incidents anyway.

Her regular personality is extremely gentle-- no matter where a fight breaks out, she'll head over
to play with a few power items in hand.

Apparently when she senses danger, she spews danmaku and a foul stench from her antennae.

Official Sources

Official sources


  1. Hidden Star in Four Seasons - Cirno's Extra
  2. Visionary Fairies in Shrine - Chapter 15
  3. Visionary Fairies in Shrine - Chapter 9.5
  4. 4.0 4.1 Nan-Yao Su (July 2014). "Tokoyo no Kami: A Caterpillar Worshipped by a Cargo Cult in Ancient Japan". American Entomologist, Volume 60, Issue 3, 1. pp. 182–188. Retrieved 2022-06-16.
  5. Hidden Star in Four Seasons - Cirno Scenario