Hello, one-person development studio "WEST SUN".

I interested in horror contents. and virgin ghost is a familiar character in Korea.

I started developing that "How about making a virgin ghost the main character of the game?"

This game was developed by mixing the feelings of the 2D platform genre in the 90s.

I would appreciate it if you could enjoy the 2D platformer genre game where the cute virgin ghost is the main character.

Since it's a game made by oneself, there may be a bug.

I would appreciate it if you could report the fatal bug by e-mail.

Thank you.



One dark day...

A strong lightning strike a shabby tomb hard.

Due to the unknown cause, a ghost in the form of a woman appears in the tomb, but

virgin ghost suffer without remembering anything.

Someone found a virgin ghost in a house nearby,

The game begins as the virgin ghost notices it and enters the house.

Why did the main character become a ghost?

Let's go on a mysterious journey to find out who did it!


Hide System

Luna, a virgin ghost, can hide slightly as a "hide".(not completely)

and It can stun state the other person for a while or pass through the body.

However, most people drink strange water, can see the existence of the ghost Luna.

Hiding is useless for animals.

Certain obstacles can be passed as 'hide' state.

Bump as 'hide' state at humans enemy.

The human enemy in stun state for a moment and the attack is valid.

Bosses have strong energy and cannot give them a state of stun, but they pass through the body as they are.

Instead, if you continue to attack, they can be stun state, so aim for that time.


Sight System

Luna hasn't been long since she became a ghost, so can only see humans her closely without lighting.

However, raising your ability widens the scope of seeing humans.

but, she can see animals regardless of sight range.



Collect souls, and raise your ability.


- The offense gradually increases, and the energy flies to the end.


- The extent to which human enemies can be seen increases. (Including human bosses)


- It becomes easier to control the movement of slippery ghosts.

Hiding time

- Hiding time increases.

Recover Hiding

- The recovery time for hiding ability is reduced.

Flying time

- Flying becomes possible, and flying time increases.

Recover Flying

- The recovery time of flying ability is reduced.


Stage progress

At the beginning of the stage, check the yellow key's image on the hint sign.

Find the key on the stage.

You can't throw away the key once you get it.

Yellow keys may have fake ones, so check them out in detail.

If the key you checked matches the key you found, obtain it.

The red key doesn't have a fake.

If you find it, get it right away.

Enter the next step using the right yellow key.

If a fake key is used, you will receive a penalty.

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hide system 3

Hello, I'm UNDEMON developer.

This time, UNDEMON will hold a 60% discount event.

[November 21, 2022 7:00pm (PST)]

Updates such as convenience improvements have been applied.

Please show a lot of interest.

Thank you.





Added new mode, analog input, languages!!!!!!!!!!!!!!!!!!!!

Sell UNDEMON at a 60% discount.

Sell UNDEMON at a 60% discount.


The 2D platformer game UNDEMON is sold at a 60% discount.

Released UNDEMON on Steam

Released UNDEMON on Steam


Finally, you can purchase undemon as Early Access from Steam.




It's a one-person development platform genre game called "UNDEMON."

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Undemon demo en

Undemon demo en


Hello, this is the experience version of UNDEMON. You can simply enjoy UNDEMON. Thank you for your interest in this game.

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